Substituted pyrazin-2-amines as inhibitors of ATR kinase

ABSTRACT

The present invention relates to pyrazine compounds useful as inhibitors of ATR protein kinase. The invention also relates to pharmaceutically acceptable compositions comprising the compounds of this invention; methods of treating of various diseases, disorders, and conditions using the compounds of this invention; processes for preparing the compounds of this invention; intermediates for the preparation of the compounds of this invention; and methods of using the compounds in in vitro applications, such as the study of kinases in biological and pathological phenomena; the study of intracellular signal transduction pathways mediated by such kinases; and the comparative evaluation of new kinase inhibitors. 
     The compounds of this invention have formula I: 
                         
wherein the variables are as defined herein.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No. 15/142,286, filed on Apr. 29, 2016, which is a divisional of U.S. application Ser. No. 14/223,109, filed on Mar. 24, 2014, which is a continuation of U.S. application Ser. No. 12/642,447, filed on Dec. 18, 2009, which claims the benefit of U.S. Provisional Application No. 61/139,420, filed on Dec. 19, 2008; U.S. Provisional Application No. 61/139,424, filed on Dec. 19, 2008; U.S. Provisional Application No. 61/139,426, filed on Dec. 19, 2008; U.S. Provisional Application No. 61/139,429, filed on Dec. 19, 2008; U.S. Provisional Application No. 61/181,794, filed on May 28, 2009; and U.S. Provisional Application No. 61/219,100, filed on Jun. 22, 2009. All of the cited applications are incorporated herein by reference in their entirety.

BACKGROUND OF THE INVENTION

ATR (“ATM and Rad3 related”) kinase is a protein kinase involved in cellular responses to DNA damage. ATR kinase acts with ATM (“ataxia telangiectasia mutated”) kinase and many other proteins to regulate a cell's response to DNA damage, commonly referred to as the DNA Damage Response (“DDR”). The DDR stimulates DNA repair, promotes survival and stalls cell cycle progression by activating cell cycle checkpoints, which provide time for repair. Without the DDR, cells are much more sensitive to DNA damage and readily die from DNA lesions induced by endogenous cellular processes such as DNA replication or exogenous DNA damaging agents commonly used in cancer therapy.

Healthy cells can rely on a host of different proteins for DNA repair including the DDR kinase ATR. In some cases these proteins can compensate for one another by activating functionally redundant DNA repair processes. On the contrary, many cancer cells harbour defects in some of their DNA repair processes, such as ATM signaling, and therefore display a greater reliance on their remaining intact DNA repair proteins which include ATR.

In addition, many cancer cells express activated oncogenes or lack key tumour suppressors, and this can make these cancer cells prone to dysregulated phases of DNA replication which in turn cause DNA damage. ATR has been implicated as a critical component of the DDR in response to disrupted DNA replication. As a result, these cancer cells are more dependent on ATR activity for survival than healthy cells. Accordingly, ATR inhibitors may be useful for cancer treatment, either used alone or in combination with DNA damaging agents, because they shut down a DNA repair mechanism that is more important for cellular survival in many cancer cells than in healthy normal cells. In fact, ATR inhibition has been shown to be effective in cancer cells as single agents and as potent sensitizers to radiotherapy and genotoxic chemotherapy.

ATR peptide can be expressed and isolated using a variety of methods known in the literature (see, e.g., Ünsal-Kaçmaz et al, PNAS 99: 10, pp 6673-6678, May 14, 2002; see also, Kumagai et al., Cell 124, pp 943-955, Mar. 10, 2006; Unsal-Kacmaz et al., Molecular and Cellular Biology, February 2004, p 1292-1300; and Hall-Jackson et al., Oncogene 1999, 18, 6707-6713).

For all of these reasons, there is a need for the development of potent and selective ATR inhibitors for the treatment of cancer, either as single agents or as combination therapies with radiotherapy or genotoxic chemotherapy.

SUMMARY OF THE INVENTION

The present invention relates to pyrazine compounds useful as inhibitors of ATR protein kinase. The invention also relates to pharmaceutically acceptable compositions comprising the compounds of this invention; methods of treating of various diseases, disorders, and conditions using the compounds of this invention; processes for preparing the compounds of this invention; intermediates for the preparation of the compounds of this invention; and methods of using the compounds in in vitro applications, such as the study of kinases in biological and pathological phenomena; the study of intracellular signal transduction pathways mediated by such kinases; and the comparative evaluation of new kinase inhibitors. These compounds have an unexpected ability to treat cancer as single agents. These compounds also show surprising synergy with other cancer agents, such as cisplatin, in combination therapies.

DETAILED DESCRIPTION OF THE INVENTION

One aspect of this invention provides a compound of Formula IA:

or a pharmaceutically acceptable salt thereof; wherein

-   Y is a C₁-C₁₀aliphatic chain wherein up to three methylene units of     the aliphatic chain are optionally replaced with O, NR⁰, S, C(O) or     S(O)₂; -   Ring A is a 5 membered heteroaryl ring selected from

-   J³ is H or C₁₋₄alkyl wherein 1 methylene unit of the alkyl group can     optionally be replaced with O, NH, N(C₁₋₄alkyl), or S and optionally     substituted with 1-3 halo; -   Q is a 5-6 membered monocyclic aromatic ring containing 0-4     heteroatoms independently selected from nitrogen, oxygen, or sulfur;     or an 8-10 membered bicyclic aromatic ring containing 0-6     heteroatoms independently selected from nitrogen, oxygen, or sulfur; -   R⁵ is H; a 3-7 membered monocyclic fully saturated, partially     unsaturated, or aromatic ring containing 0-4 heteroatoms     independently selected from nitrogen, oxygen, or sulfur; an 8-10     membered bicyclic fully saturated, partially unsaturated, or     aromatic ring containing 0-6 heteroatoms independently selected from     nitrogen, oxygen, or sulfur; R⁵ is optionally substituted with 1-5     J⁵ groups; -   L is a C₁₋₄alkyl chain wherein up to two methylene units of the     alkyl chain are optionally replaced with O, NR⁶, S, —C(O)—, —SO—, or     —SO₂—; -   R⁰ is H or C₁-C₆alkyl wherein one methylene unit of the alkyl chain     can be optionally replaced with O, NH, N(C₁₋₄alkyl), or S; -   R¹ is H or C₁-C₆alkyl; -   R² is H, C₁-C₆alkyl, —(C₂-C₆alkyl)-Z or a 4-8 membered cyclic ring     containing 0-2 nitrogen atoms; wherein said ring is bonded via a     carbon atom and is optionally substituted with one occurrence of     J^(Z); -   or R¹ and R², taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 heteroatoms     selected from oxygen, nitrogen, or sulfur; wherein said heterocyclic     ring is optionally substituted with one occurrence of J^(Z1); -   J^(Z1) is halo, CN, C₁-C₈aliphatic, —(X)_(t)—CN, or —(X)_(r)—Z;     wherein said up to two methylene units of said C₁-C₈aliphatic can be     optionally replaced with O, NR, S, P(O), C(O), S(O), or S(O)₂;     wherein said C₁-C₈aliphatic is optionally substituted with halo, CN,     or NO₂; -   X is C₁-C₄alkyl; -   each t, r and m is independently 0 or 1; -   Z is —NR³R⁴; -   R³ is H or C₁-C₂alkyl; -   R⁴ is H or C₁-C₆alkyl; -   or R³ and R⁴, taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 heteroatoms     selected from oxygen, nitrogen, or sulfur; wherein said ring is     optionally substituted with one occurrence of J^(Z); -   R⁶ is H, or C₁-C₆alkyl; -   J^(Z) is independently NH₂, NH(C₁₋₄aliphatic), N(C₁₋₄aliphatic)₂,     halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic), NO₂, CN, CO₂H,     CO(C₁₋₄aliphatic), CO₂(C₁₋₄aliphatic), O(haloC₁₋₄aliphatic), or     haloC₁₋₄aliphatic; -   J⁵ is halo, oxo, CN, NO₂, X¹—R, or —(X¹)_(p)Q⁴; -   X¹ is C₁₋₁₀aliphatic; wherein 1-3 methylene units of said     C₁₋₁₀aliphatic are optionally replaced with —NR′—, —O—, —S—,     C(═NR′), C(O), S(O)₂, or S(O); wherein X¹ is optionally and     independently substituted with 1-4 occurrences of NH₂,     NH(C₁₋₄aliphatic), N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH,     O(C₁₋₄aliphatic), NO₂, CN, CO₂H, CO₂(C₁₋₄aliphatic), C(O)NH₂,     C(O)NH(C₁₋₄aliphatic), C(O)N(C₁₋₄aliphatic)₂, SO(C₁₋₄aliphatic),     SO₂(C₁₋₄aliphatic), SO₂NH(C₁₋₄aliphatic), SO₂NH(C₁₋₄aliphatic),     NHC(O)(C₁₋₄aliphatic), N(C₁₋₄aliphatic)C(O)(C₁₋₄aliphatic), wherein     said C₁₋₄aliphatic is optionally substituted with 1-3 occurrences of     halo; -   Q⁴ is a 3-8 membered saturated or unsaturated monocyclic ring having     0-4 heteroatoms independently selected from nitrogen, oxygen, or     sulfur, or a 8-10 membered saturated or unsaturated bicyclic ring     having 0-6 heteroatoms independently selected from nitrogen, oxygen,     or sulfur; each Q⁴ is optionally substituted with 1-5 J^(Q4); -   J^(Q4) is halo, CN, or C₁₋₄alkyl wherein up to 2 methylene units are     optionally replaced with O, NR*, S, C(O), S(O), or S(O)₂; -   R is H or C₁₋₄alkyl wherein said C₁₋₄alkyl is optionally substituted     with 1-4 halo; -   J² is halo; CN; a 5-6 membered aromatic or nonaromatic monocyclic     ring having 0-3 heteroatoms selected from oxygen, nitrogen, or     sulfur; or a C₁₋₁₀aliphatic group wherein up to 2 methylene units     are optionally replaced with O, NR″, C(O), S, S(O), or S(O)₂;     wherein said C₁₋₁₀aliphatic group is optionally substituted with 1-3     halo or CN; and said monocyclic ring is optionally substituted with     1-3 occurrences of halo; CN; a C₃₋₆cycloalkyl; a 3-7 membered     heterocyclyl containing 0-2 heteroatoms selected from oxygen,     nitrogen, or sulfur; or a C₁₋₄alkyl wherein up to one methylene unit     of the alkyl chain is optionally replaced with O, NR″, or S; and     wherein said C₁₋₄alkyl is optionally substituted with 1-3 halo; -   q is 0, 1, or 2; -   p is 0 or 1; -   R′, R″, and R* are each independently H, C₁₋₄alkyl, or is absent;     wherein said C₁₋₄alkyl is optionally substituted with 1-4 halo.

In some embodiments,

-   Y is a C₁-C₆aliphatic chain wherein one methylene unit of the alkyl     chain is optionally replaced with C(O) or —NR⁰—; and -   R⁵ is a 3-7 membered monocyclic fully saturated, partially     unsaturated, or aromatic ring containing 0-4 heteroatoms     independently selected from nitrogen, oxygen, or sulfur; or an 8-10     membered bicyclic fully saturated, partially unsaturated, or     aromatic ring containing 0-6 heteroatoms independently selected from     nitrogen, oxygen, or sulfur; R⁵ is optionally substituted with 1-5     J⁵ groups, provided that when Ring A is

-    p is 1; and R⁵ is aromatic.

In some embodiments, Ring A is a 5 membered heteroaryl ring selected from

In other embodiments, ring A is

In other embodiments, ring A is

It should be understood that Ring A structures can be bound to the pyrazine ring in two different ways: as drawn, and the reverse (flipped). For example, when Ring A is

it can be bound to the pyrazine ring as shown below:

Similarly, when Ring A is

it can also be bound to the pyrazine ring in two ways—as drawn and reversed. In some embodiments, the Ring A structures are bound as drawn.

In other embodiments, J³ is H.

In yet other embodiments, Y is a C₁₋₂alkyl chain wherein one methylene unit of the alkyl chain is optionally replaced with —NR⁰—.

In some embodiments, J⁵ is a C₁₋₆aliphatic group wherein up to 2 methylene units are optionally replaced with O or NR′R″ where each R′ and R″ is independently H or alkyl; or R′ and R″ taken together to form a 3-6 membered heterocyclic ring; NH₂, NH(C₁₋₄aliphatic), N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic), NO₂, CN, CO₂H, CO(C₁₋₄aliphatic), CO₂(C₁₋₄aliphatic), O(haloC₁₋₄aliphatic), or haloC₁₋₄aliphatic;

In other embodiments, J² is halo, C₁-C₂alkyl optionally substituted with 1-3 fluoro, CN, or a C₁₋₄alkyl group wherein up to 2 methylene units are optionally replaced with S(O), S(O)₂, C(O), or NR′.

In yet another embodiment,

-   -   Y is NH;     -   R⁵ is 5-6 membered monocyclic aryl or heteroaryl ring having 0-3         heteroatoms independently selected from nitrogen, oxygen, or         sulfur, R⁵ is optionally fused to a 5-6 membered aromatic ring         containing 0-2 heteroatoms selected from N, O, or S; each R⁵ is         optionally substituted with 1-5 J⁵ groups;     -   L is —C(O)— or —SO₂—;     -   R¹ is H, or C₁-C₆alkyl;     -   R² is —(C₂-C₆alkyl)-Z or a 4-8 membered cyclic ring containing         0-2 nitrogen atoms; wherein said ring is bonded via a carbon         atom and is optionally substituted with one occurrence of J^(Z);     -   or R¹ and R², taken together with the atom to which they are         bound, form a 4-8 membered heterocyclic ring containing 1-2         nitrogen atoms; wherein said heterocyclic ring is optionally         substituted with one occurrence of J^(Z1);     -   J^(Z1)- is —(X)_(t)—CN, C₁-C₆alkyl or —(X)_(r)—Z;     -   R³ is H or C₁-C₂alkyl;     -   R⁴ is H or C₁-C₆alkyl;     -   or R³ and R⁴, taken together with the atom to which they are         bound, form a 4-8 membered heterocyclic ring containing 1-2         heteroatoms selected from oxygen, nitrogen, or sulfur; wherein         said ring is optionally substituted with one occurrence of         J^(Z);     -   J⁵ is halogen, NO₂, CN, O(haloC₁₋₄aliphatic), haloC₁₋₄aliphatic,         or a C₁₋₆aliphatic group wherein up to 2 methylene units are         optionally replaced with C(O), O, or NR′; and     -   J² is halo, C₁-C₂alkyl optionally substituted with 1-3 fluoro,         or CN.

According to another embodiment, L is —C(O)—, m is 0, and R¹ and R², taken together with the atom to which they are bound, form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms. In some embodiments, said heterocyclyl is pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl.

According to another embodiment, m is 0, q is 0, and -L-NR¹R² is C(O)pyrrolidinyl, C(O)piperidinyl, C(O)piperazinyl, C(O) azepanyl, C(O) 1,4-diazepanyl, C(O)NH-piperidinyl, C(O)NHCH₂CH₂-pyrrolidinyl, C(O)NHCH₂CH₂-piperidinyl, CON(CH₃)CH₂CH₂N(CH₃)₂, wherein said pyrrolidinyl, piperidinyl, piperazinyl, azepanyl or 1,4-diazepanyl is optionally substituted with C₁₋₄alkyl or N(C₁₋₄alkyl)₂.

According to yet another embodiment, J² is halo; CN; phenyl; oxazolyl; or a C₁₋₆aliphatic group wherein up to 2 methylene units are optionally replaced with O, NR″, C(O), S, S(O), or S(O)₂; said C₁₋₆aliphatic group is optionally substituted with 1-3 fluoro or CN.

Another embodiment provides a compound of Formula IA′:

or a pharmaceutically acceptable salt thereof; wherein

-   Y is a C₁-C₄alkyl chain wherein one methylene unit of the alkyl     chain is optionally replaced with —NR⁰—; -   G is O or S; -   Q is a 5-6 membered monocyclic aromatic ring containing 0-4     heteroatoms independently selected from nitrogen, oxygen, or sulfur;     or an 8-10 membered bicyclic aromatic ring containing 0-6     heteroatoms independently selected from nitrogen, oxygen, or sulfur; -   R⁵ is a 3-7 membered monocyclic fully saturated, partially     unsaturated, or aromatic ring containing 0-4 heteroatoms     independently selected from nitrogen, oxygen, or sulfur; or an 8-10     membered bicyclic fully saturated, partially unsaturated, or     aromatic ring containing 0-6 heteroatoms independently selected from     nitrogen, oxygen, or sulfur; R⁵ is optionally substituted with 1-5     J⁵ groups; -   L is C₁₋₄alkyl chain wherein up to two methylene units of the alkyl     chain are optionally replaced with O, NR⁶, S, —C(O)—, —SO—, or     —SO₂—; -   R⁰ is H or C₁-C₆alkyl; -   R¹ is H or C₁-C₆alkyl; -   R² is H, C₁-C₆alkyl, —(C₂-C₆alkyl)-Z or a 4-8 membered cyclic ring     containing 0-2 nitrogen atoms; wherein said ring is bonded via a     carbon atom and is optionally substituted with one occurrence of     J^(Z); -   or R¹ and R², taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 heteroatoms     selected from nitrogen, sulfur, or oxygen; wherein said heterocyclic     ring is optionally substituted with one occurrence of J^(Z1); -   J^(Z1) is —(X)_(t)—CN, C₁-C₆alkyl or —(X)_(r)—Z; -   X is C₁-C₄alkyl; -   each t, r and m is independently 0 or 1; -   Z is —NR³R⁴; -   R³ is H or C₁-C₂alkyl; -   R⁴ is H or C₁-C₆alkyl; -   or R³ and R⁴, taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said ring is optionally substituted with one occurrence of     J^(Z); -   R⁶ is H, or C₁-C₆alkyl; -   J^(Z) is independently NH₂, NH(C₁₋₄aliphatic), N(C₁₋₄aliphatic)₂,     halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic), NO₂, CN, CO₂H,     CO(C₁₋₄aliphatic), CO₂(C₁₋₄aliphatic), O(haloC₁₋₄aliphatic), or     haloC₁₋₄aliphatic; -   J⁵ is halo, oxo, CN, NO₂, X¹—R, or —(X¹)_(p)-Q⁴, -   X¹ is C₁₋₁₀aliphatic; wherein 1-3 methylene units of said     C₁₋₁₀aliphatic are optionally replaced with —NR′—, —O—, —S—, C(O),     S(O)₂, or S(O); wherein X¹ is optionally and independently     substituted with 1-4 occurrences of NH₂, NH(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic),     NO₂, CN, CO₂H, CO₂(C₁₋₄aliphatic), C(O)NH₂, C(O)NH(C₁₋₄aliphatic),     C(O)N(C₁₋₄aliphatic)₂, SO(C₁₋₄aliphatic), SO₂(C₁₋₄aliphatic),     SO₂NH(C₁₋₄aliphatic), SO₂NH(C₁₋₄aliphatic), NHC(O)(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)C(O)(C₁₋₄aliphatic), wherein said C₁₋₄aliphatic is     optionally substituted with 1-3 occurrences of halo; -   Q⁴ is a 3-8 membered saturated or unsaturated monocyclic ring having     0-4 heteroatoms independently selected from nitrogen, oxygen, or     sulfur, or a 8-10 membered saturated or unsaturated bicyclic ring     having 0-6 heteroatoms independently selected from nitrogen, oxygen,     or sulfur; each Q⁴ is optionally substituted with 1-5 J^(Q4); -   J^(Q4) is halo, CN, or C₁₋₄alkyl wherein up to 2 methylene units are     optionally replaced with O, NR*, S, C(O), S(O), or S(O)₂; -   R is H or C₁₋₄alkyl wherein said C₁₋₄alkyl is optionally substituted     with 1-4 halo; -   J² is halo; CN; a 5-6 membered aromatic or nonaromatic monocyclic     ring having 0-3 heteroatoms selected from oxygen, nitrogen, or     sulfur; or a C₁₋₁₀aliphatic group wherein up to 2 methylene units     are optionally replaced with O, NR″, C(O), S, S(O), or S(O)₂;     wherein said C₁₋₁₀aliphatic group is optionally substituted with 1-3     halo or CN; and said monocyclic ring is optionally substituted with     1-3 halo; CN; a C₃₋₆cycloalkyl; a 3-7 membered heterocyclyl     containing 0-2 heteroatoms selected from oxygen, nitrogen, or     sulfur; or a C₁₋₄alkyl wherein up to one methylene unit of the alkyl     chain is optionally replaced with O, NR″, or S; -   R′, R″, and R* are each independently H, C₁₋₄alkyl, or is absent;     wherein said C₁₋₄alkyl is optionally substituted with 1-4 halo. -   q is 0, 1, or 2, -   p is 0 or 1.

In some embodiments, J⁵ is halogen, NO₂, CN, O(haloC₁₋₄aliphatic), haloC₁₋₄aliphatic, or a C₁₋₆aliphatic group wherein up to 2 methylene units are optionally replaced with C(O), O, or NR′. In other embodiments, J⁵ is halo, CN, phenyl, oxazolyl, or a C₁₋₆aliphatic group wherein up to 2 methylene units are optionally replaced with O, NR′, C(O), S, S(O), or S(O)₂; said C₁₋₆aliphatic group is optionally substituted with 1-3 fluoro or CN.

In yet other embodiments, J² is halo; CN; phenyl; oxazolyl; or a C₁₋₆aliphatic group wherein up to 2 methylene units are optionally replaced with O, NR″, C(O), S, S(O), or S(O)₂; said C₁₋₆aliphatic group is optionally substituted with 1-3 fluoro or CN.

In some embodiments, Y is a C₁-C₂alkyl chain wherein one methylene unit of the alkyl chain is optionally replaced with NR⁰.

In some embodiments, p is 0 and Q is phenyl, indolyl, pyridyl, naphthyl or benzothienyl, or quinolinyl. In certain embodiments, Q is phenyl, indolyl, pyridyl, or quinolinyl. In some embodiments, Q is phenyl or pyridyl. In some embodiments, phenyl. In other embodiments, pyridyl.

J² is —OCH₃, —OCH₂CH₂N(CH₃)₂, —NHCH₂CH₂N(CH₃)₂, or piperazinyl.

The compound according to claim 19, wherein Q is substituted in the ortho position, the para position, or in both the ortho and the para position.

The compound according to claim 19, wherein Q is substituted at the para position with J², wherein the J² is a C₁₋₆aliphatic group wherein the methylene group bonded to Ring Q is replaced with —SO₂—.

The compound of claim 19 wherein at least one more methylene unit of the C₁₋₆aliphatic group is optionally replaced with a heteroatom selected from the group consisting of O, NR″, and S.

The compound according to claim 19, wherein Q is substituted at the para position with —SO₂(C₁₋₄alkyl), —SO₂(C₁₋₄alkyl)N(C₁₋₄alkyl)₂, C(O)N(C₁₋₄alkyl)₂, C(O)(1,4-diazepanyl), CO(azepanyl), C(O)(piperazinyl), or C(O)(piperidinyl).

The compound of claim 21, wherein at least one more methylene unit of the C₁₋₆aliphatic group is optionally replaced with a heteroatom selected from the group consisting of O, NR″, and S.

In some embodiments, Q is optionally substituted in the ortho-position with one J², wherein J² is C₁-C₄alkyl, NH₂, NHC(O)CH₃, O(C₁-C₄alkyl), CH₂OH, CH₂OCH₃, CH₂CH₂OCH₃, CH₂CN, CN, CH₂C(O)NH₂, OH, OCF₃, CF₃, CHF₂, —CH═CHF, NHCOCH₃, COCH₃, CONH₂, SCH₃, SOCH₃, SOCH₂CH₃, SO₂CH(CH₃)₂, —C≡CH, oxazolyl, or phenyl. In some embodiments, J² is substituted in the ortho position with CH₂OH, CHF₂, S(O)CH₃, or S(O)CH₂CH₃.

In yet other embodiments, Q is optionally substituted in the ortho-position with J², wherein J² is C₁₋₄alkyl, —C≡C—(C₁₋₄alkyl), CH═CH₂, CH═CHF, O(C₁₋₄alkyl), NH(C₁₋₄alkyl), N(C₁₋₄alkyl)₂, —(C₁₋₄alkyl)OH, —(C₁₋₄alkyl)O(C₁₋₄alkyl), —(C₁₋₄alkyl)NH₂, —(C₁₋₄alkyl)NH(C₁₋₄alkyl), —(C₁₋₄alkyl)N(C₁₋₄alkyl)₂, —(C₁₋₄alkyl)CN, CO(C₁₋₄alkyl), CON(C₁₋₄alkyl)₂, C(O)O(C₁₋₄alkyl), S(C₁₋₄alkyl), —S—(C₁₋₄alkyl)NH₂, S(O)(C₁₋₄alkyl)NH₂, S(O)₂(C₁₋₄alkyl)OH, S(O)(C₁₋₄alkyl)NHC(O)O(t-butyl), NHS(O)₂(C₁₋₄alkyl), halo, or CN.

In some embodiments, J² is CH₂CH₂OH, SCH(CH₃)₂, —C≡CCH₃, halo, CN, CON(CH₃)₂, CH₂CN, S(O)CH₂CH₂NH₂, SCH₂CH₂NH₂, C(O)OCH₃, CH₂N(CH₃)₂, S(O)CH₂CH₂NHBOC, N(CH₃)₂, NHSO₂CH₃, CH═CHF, CH₂OCH₃, CH═CH₂, SCH₂CH₃, or —CH═CH.

In other embodiments, Q is optionally substituted in the para position with J², wherein J² is —SO₂(C₁₋₄alkyl), —SO₂(C₃₋₆cycloalkyl), —SO₂(3-6 membered heterocyclyl), —SO₂(C₁₋₄alkyl)N(C₁₋₄alkyl)₂, —C(O)(C₁₋₄alkyl), —(C₁₋₄alkyl)N(C₁₋₄alkyl)₂, or —NHC(O)(C₁₋₄alkyl).

In some embodiments, said 3-6 membered heterocyclyl is tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, pyrrolidinyl, or piperidinyl.

In yet other embodiments, Q is optionally substituted in the meta position with J² wherein J² is C₁₋₄alkyl, C₁₋₄alkoxy, halo, haloC₁₋₄alkyl, haloC₁₋₄alkoxyl, CN, SO₂(C₁₋₄alkyl), NHSO₂(C₁₋₄alkyl), C(O)(C₁₋₄alkyl), C(O)NH₂, NHC(O)(C₁₋₄alkyl), —(C₁₋₄alkyl)-OH, —(C₁₋₄alkyl)-O(C₁₋₄alkyl), —(C₁₋₄alkyl)-NH₂, —(C₁₋₄alkyl)-N(C₁₋₄alkyl)₂, or —(C₁₋₄alkyl)NH(C₁₋₄alkyl).

In some embodiments, Q is naphthyl or benzothienyl.

In another embodiment, Q is pyridyl. In some embodiments, Q is substituted in the ortho-position with one J², wherein J² is CN.

In some embodiments, Q is substituted with one or two J², wherein J² is a C₁₋₆aliphatic group wherein up to 2 methylene units are optionally replaced with O or NR″.

In some embodiments, J² is —OCH₃, —OCH₂CH₂N(CH₃)₂, —NHCH₂CH₂N(CH₃)₂, or piperazinyl.

In another embodiment, p is 1. In some embodiments, Q is phenyl, pyridyl, or naphthyl. In some embodiments, said pyridyl is 3-pyridyl or 4-pyridyl. In other embodiments, Q is phenyl.

In some embodiments, Q comprises Q¹ and optionally Q² as shown in formula IA-i, wherein Q¹ is a six membered ring and -LNR¹R² is substituted in the para-position as shown below:

In some embodiments, J⁵ is halogen, NO₂, CN, O(haloC₁₋₄aliphatic), haloC₁₋₄aliphatic, or a C₁₋₆aliphatic group wherein up to 2 methylene units are optionally replaced with C(O), O, or NR′.

In some embodiments, Q¹ is phenyl or pyridyl. In other embodiments, Q¹-Q² is naphthyl.

In some embodiments, Y is a C₁-C₂alkyl chain wherein one methylene unit of the alkyl chain is optionally replaced with NR⁰.

In other embodiments, L is —C(O)— or —SO₂—.

In yet other embodiments, R¹ and R², taken together with the atom to which they are bound, form a 4-8 membered heterocyclic ring containing 1-2 heteroatoms selected from nitrogen, sulfur, or oxygen. In some embodiments, said heterocyclic ring is selected from pyrrolidinyl, piperidinyl, piperazinyl, morpholinyl, 1,4-diazepanyl, or 1,4-oxazepanyl. In yet other embodiments, R¹ is C₁-C₆alkyl. In some embodiments, said heterocyclic ring is optionally substituted with halo, CN, C₁₋₆aliphatic, haloC₁₋₆aliphatic, —C(O)O(C₁₋₆aliphatic), C(O)H, C(O)(C₁₋₆aliphatic), P(O)(OC₁₋₄alkyl)₂, NH(C₁₋₆aliphatic), or N(C₁₋₆aliphatic)₂.

In some embodiments, R² is C₁-C₆alkyl. In other embodiments, R² is —(C₂-C₆alkyl)-Z.

According to another embodiment, m is 0.

According to yet another embodiment, q is 0.

In some embodiments, L is —C(O)—.

In some embodiments, R¹ and R², taken together with the atom to which they are bound, form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms. In some embodiments, said heterocyclic ring is selected from pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl. In other embodiments said heterocyclic ring is selected from

In some embodiments, t is 1. In other embodiments, t is 0.

In other embodiments, R¹ is H or C₁-C₆alkyl; and R² is —(C₂-C₆alkyl)-Z. In some embodiments, R¹ is C₁-C₆alkyl. In some embodiments, Z is —NR³R⁴, wherein R³ and R⁴ are both C₁-C₂alkyl. In other embodiments, R³ and R⁴, taken together with the atom to which they are bound, form a ring selected from pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl. In some embodiments, said ring is pyrrolidinyl or piperidinyl.

In some embodiments, said ring is optionally substituted with one J^(Z1). In some embodiments, J^(Z1) is (X)_(r)—Z. In other embodiments, J^(Z1) is C₁₋₄alkyl or N(C₁₋₄alkyl)₂.

In one embodiment, p is 0, q is 0, and -L-NR¹R² is C(O)pyrrolidinyl, C(O)piperidinyl, C(O)piperazinyl, C(O)azepanyl, C(O)1,4-diazepanyl, C(O)NH-piperidinyl, C(O)NHCH₂CH₂-pyrrolidinyl, C(O)NHCH₂CH₂-piperidinyl, CON(CH₃)CH₂CH₂N(CH₃)₂, wherein said pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl is optionally substituted with C₁₋₄alkyl or N(C₁₋₄alkyl)₂. In one embodiment, -L-NR¹R² is C(O)1,4-diazepanyl.

According to another aspect, m is 0. In some embodiments, R⁵ is thienyl, thiazolyl, furanyl, pyrrolidinyl, azetidinyl, piperidinyl, piperazinyl, morpholinyl, pyridinonyl, pyridyl, tetrahydropyridinyl, tetrahydroisoquinolinyl, 1,4-diazepanyl, azabicyclo[2.2.1]heptanyl, or phenyl. In other embodiments, R⁵ is phenyl, piperidinyl or thienyl. In some embodiments, Q is optionally substituted in the para position with —SO₂(C₁₋₄alkyl), —SO₂(C₁₋₄alkyl)N(C₁₋₄alkyl)₂, C(O)N(C₁₋₄alkyl)₂, C(O)(1,4-diazepanyl), C(O)(piperazinyl), or C(O)(piperidinyl).

According to another aspect, R⁵ is phenyl. In some embodiments, R⁵ is optionally substituted with 1-2 J⁵ groups, wherein J⁵ is selected from halo, CN, NO₂, X¹—R, or —(X¹)_(p)-Q⁴; p is 0-1; X¹ is a C₁₋₁₀aliphatic wherein 1-3 methylene units of said C₁₋₆aliphatic are optionally replaced with —NR′—, —O—, —S—, C(═NH)—, C(O), S(O)₂, or S(O); R is H; and Q⁴ is a 3-6 membered monocyclic ring containing 0-2 heteroatoms selected from O or N, wherein X¹ is optionally substituted with 1-3 occurrences of halo or CN.

In other embodiments, J⁵ is a C₁₋₁₀aliphatic chain wherein 1-2 methylene units of X¹ are replaced with —O— or —NR′—.

According to another aspect, R⁵ is piperidinyl optionally substituted with NH₂ or —(C₁₋₄alkyl)NH₂. According to yet another aspect, R⁵ is thienyl optionally substituted with CN, C₁₋₆alkyl, —(C₁₋₄alkyl)NH₂, —(C₁₋₄alkyl)NH(C₁₋₆alkyl), —(C₁₋₄alkyl)N(C₁₋₆alkyl)₂, O(C₁₋₆alkyl), pyrrolidinyl, wherein said alkyl is optionally substituted with 1-3 halo.

In some embodiments, Q⁴ is an optionally substituted 3-6 membered cycloalkyl ring. In other embodiments, Q⁴ is an optionally substituted 3-6 membered heterocyclic ring selected from pyrrolidinyl, azetidinyl, or thienyl.

In some embodiments, J⁵ is halo, C₁₋₆alkyl, NO₂, CN, C₁₋₆alkyl, —CH═CH₂, OH, OCH₃, OCH₂CH₃, OCH(CH₃)₂, NH₂, CH₂NH₂, CH₂OH, CH(CH₃)NHCH₃, C(CH₃)₂NH₂, CH₂CH₂NH₂, CH₂CH₂OH, CH₂NHCH₃, CH₂N(CH₃)₂, CH(CH₃)NH₂, CH(CH₃)NHC(O)O(CH₃)₃, CH₂NHC(CH₃)₂, CH₂NHCH₂CHF₂, CH₂NHCH₂CH(CH₃)OH, CH₂NHCH₂C(CH₃)₂₀H, CH₂NHCH₂CH(OH)-cyclopropyl, CH₂NHCH₂CH₂N(CH₃)₂, CH₂NHCH(CH₂CH₃)₃, CH₂NHCH₃, CH₂NHCH₂CH₃, CH₂NHCH₂CH₂CH₃, CH₂NH-cyclopropyl, CH₂NHCH₂CH₂OH, CH₂NHCH₂CH₂OCH₃, CH₂NHCH₂CH₂OCH₂CH₂OH, azetidinyl, pyrrolidinyl, CF₃, C(═NH)NH₂, C(═NH)NH(CH₃), thienyl, CH₂NH-cyclopropyl, CH₂NH(CH₂OH)₃, OCH₂CH₂OH, OCH₂CH₂CH₂OH, OCH₂CH₂NHC(O)OC(CH₃)₃, CH₂NHC(O)O(CH₃)₃, or CH₂OC(O)CH₃.

According to another aspect, m is 1.

In some embodiments, R⁵ is H.

In some embodiments, Y is —NH—, —NHCH₂—, —NHC(O)—, C(O)NH, C(O)NHCH₂, C(O), —NHCH(CH₃)— or —N(CH₃)CH₂—; and R⁵ is phenyl. In some embodiments, R⁵ is optionally substituted with halo or C₁₋₄alkyl, wherein up to 1 methylene unit is optionally replaced with O, NR′, or S.

Another embodiment provides a compound of Formula:

or a pharmaceutically acceptable salt thereof; wherein Ring A is a 5 membered heteroaryl ring selected from

-   Y is a C₁-C₄alkyl chain wherein one methylene unit of the alkyl     chain is optionally replaced with —NR⁰—; -   Q is a 5-6 membered monocyclic aromatic ring containing 0-4     heteroatoms independently selected from nitrogen, oxygen, or sulfur;     or an 8-10 membered bicyclic aromatic ring containing 0-6     heteroatoms independently selected from nitrogen, oxygen, or sulfur; -   R⁵ is 5-6 membered monocyclic aryl or heteroaryl ring having 0-3     heteroatoms independently selected from nitrogen, oxygen, or sulfur,     R⁵ is optionally fused to a 5-6 membered aromatic ring containing     0-2 heteroatoms selected from N, O, or S; each R⁵ is optionally     substituted with 1-5 J⁵ groups; -   L is —C(O)— or —SO₂—; -   R¹ is H, or C₁-C₆alkyl; -   R⁰ is H or C₁-C₆alkyl; -   R² is C₁-C₆alkyl, —(C₂-C₆alkyl)-Z or a 4-8 membered cyclic ring     containing 0-2 nitrogen atoms; wherein said ring is bonded via a     carbon atom and is optionally substituted with one occurrence of     J^(Z); -   or R¹ and R², taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 heteroatoms     selected from nitrogen, sulfur, or oxygen; wherein said heterocyclic     ring is optionally substituted with one occurrence of J^(Z1); -   J^(Z1) is (X)_(t)—CN, C₁-C₆alkyl or —(X)_(r)—Z; -   X is C₁-C₄alkyl; -   each t, r and m is independently 0 or 1; -   Z is —NR³R⁴; -   R³ is H or C₁-C₂alkyl; -   R⁴ is H or C₁-C₆alkyl; -   or R³ and R⁴, taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said ring is optionally substituted with one occurrence of     J^(Z); -   J^(Z) is NH₂, NH(C₁₋₄aliphatic), N(C₁₋₄aliphatic)₂, halogen,     C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic), NO₂, CN, CO₂H,     CO(C₁₋₄aliphatic), CO₂(C₁₋₄aliphatic), O(haloC₁₋₄aliphatic), or     haloC₁₋₄aliphatic; -   J⁵ is halogen, NO₂, CN, O(haloC₁₋₄aliphatic), haloC₁₋₄aliphatic, or     a C₁₋₆aliphatic group wherein up to 2 methylene units are optionally     replaced with C(O), O, or NR′; -   J² is halo; CN; phenyl; oxazolyl; or a C₁₋₆aliphatic group wherein     up to 2 methylene units are optionally replaced with O, NR″, C(O),     S, S(O), or S(O)₂; said C₁₋₆aliphatic group is optionally     substituted with 1-3 fluoro or CN; -   R′ and R″ are each independently H or C₁-C₄ alkyl; -   q is 0, 1, or 2, -   p is 0 or 1.

In some embodiments, Q is phenyl or pyridyl.

In other embodiments, Y is a C₁-C₂alkyl chain wherein one methylene unit of the alkyl chain is optionally replaced with NR⁰.

Another embodiment provides a Compound from Table IIA-2:

TABLE IIA-2

IIA-1

IIA-2

IIA-3

IIA-4

IIA-5

IIA-6

IIA-7

IIA-8

IIA-9

IIA-10

IIA-11

IIA-12

IIA-13

IIA-14

IIA-15

IIA-16

Another embodiment provides a compound of Formula IIIA:

or a pharmaceutically acceptable salt thereof; wherein

-   Y is a C₁-C₄alkyl chain wherein one methylene unit of the alkyl     chain is optionally replaced with —NR⁰—; -   Q is phenyl or pyridyl; -   R⁵ is 5-6 membered monocyclic aryl or heteroaryl ring having 0-3     heteroatoms independently selected from nitrogen, oxygen, or sulfur,     R⁵ is optionally fused to a 5-6 membered aromatic ring containing     0-2 heteroatoms selected from N, O, or S; each R⁵ is optionally     substituted with 1-5 J⁵ groups; -   L is —C(O)— or —SO₂—; -   R¹ is H, or C₁-C₆alkyl; -   R⁰ is H or C₁-C₆alkyl; -   R² is C₁-C₆alkyl, —(C₂-C₆alkyl)-Z or a 4-8 membered cyclic ring     containing 0-2 nitrogen atoms; wherein said ring is bonded via a     carbon atom and is optionally substituted with one occurrence of     J^(Z); -   or R¹ and R², taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 heteroatoms     selected from nitrogen, sulfur, or oxygen; wherein said heterocyclic     ring is optionally substituted with one occurrence of J^(Z1); -   J^(Z1) is —(X)_(t)—CN, C₁-C₆alkyl or —(X)_(r)—Z; -   X is C₁-C₄alkyl; -   each t, r and m is independently 0 or 1; -   Z is —NR³R⁴; -   R³ is H or C₁-C₂alkyl; -   R⁴ is H or C₁-C₆alkyl; -   or R³ and R⁴, taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said ring is optionally substituted with one occurrence of     J^(Z); -   J^(Z) is NH₂, NH(C₁₋₄aliphatic), N(C₁₋₄aliphatic)₂, halogen,     C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic), NO₂, CN, CO₂H,     CO(C₁₋₄aliphatic), CO₂(C₁₋₄aliphatic), O(haloC₁₋₄aliphatic), or     haloC₁₋₄aliphatic; -   J⁵ is halogen, NO₂, CN, O(haloC₁₋₄aliphatic), haloC₁₋₄aliphatic, or     a C₁₋₆aliphatic group wherein up to 2 methylene units are optionally     replaced with C(O), O, or NR′; -   J² is halo; CN; phenyl; oxazolyl; or a C₁₋₆aliphatic group wherein     up to 2 methylene units are optionally replaced with O, NR″, C(O),     S, S(O), or S(O)₂; said C₁₋₆aliphatic group is optionally     substituted with 1-3 fluoro or CN; -   R′ and R″ are each independently H or C₁-C₄ alkyl; -   q is 0, 1, or 2, -   p is 0 or 1.

In some embodiments, Y is a C₁-C₂alkyl chain wherein one methylene unit of the alkyl chain is optionally replaced with NR⁰.

In other embodiments, p is 0 and Q is pyridyl. In some embodiments, m is 0.

In yet other embodiments, R⁵ is phenyl or thienyl. In some embodiments, R⁵ is phenyl optionally substituted with one occurrence of NH₂, C₁-C₄alkyl, or CH₂NH₂.

Another embodiment provides a compound selected from Table IIIA:

TABLE IIIA

IIIA-1

IIIA-2

IIIA-3

IIIA-4

IIIA-5

IIIA-6

IA-3

Another aspect provides a compound of formula IA-ii:

or a pharmaceutically acceptable salt thereof wherein

-   Y is NH; -   Ring A is a 5 membered heteroaryl ring selected from

-   R⁵ is 5-6 membered monocyclic aryl or heteroaryl ring having 0-3     heteroatoms independently selected from nitrogen, oxygen, or sulfur,     R⁵ is optionally fused to a 5-6 membered aromatic ring containing     0-2 heteroatoms selected from N, O, or S; each R⁵ is optionally     substituted with 1-5 J⁵ groups; -   L is —C(O)— or —SO₂—; -   R¹ is H, or C₁-C₆alkyl; -   R² is —(C₂-C₆alkyl)-Z or a 4-8 membered cyclic ring containing 0-2     nitrogen atoms; wherein said ring is bonded via a carbon atom and is     optionally substituted with one occurrence of J^(Z); -   or R¹ and R², taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said heterocyclic ring is optionally substituted with one     occurrence of J^(Z1); -   J^(Z1) is —(X)_(t)—CN, C₁-C₆alkyl or —(X)_(r)—Z; -   X is C₁-C₄alkyl; -   each t, r and m is independently 0 or 1; -   Z is —NR³R⁴; -   R³ is H or C₁-C₂alkyl; -   R⁴ is H or C₁-C₆alkyl; -   or R³ and R⁴, taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said ring is optionally substituted with one occurrence of     J^(Z); -   each J^(Z), J¹, and J⁵ is independently NH₂, NH(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic),     NO₂, CN, CO₂H, CO(C₁₋₄aliphatic), CO₂(C₁₋₄aliphatic),     O(haloC₁₋₄aliphatic), or haloC₁₋₄aliphatic; -   J² is halo, C₁-C₂alkyl optionally substituted with 1-3 fluoro, or     CN; -   q is 0, 1, or 2.

According to one embodiment, Ring A is

According to another embodiment, m is 0.

According to another embodiment, q is 0.

In some embodiments, L is —C(O)—.

In some embodiments, R¹ and R², taken together with the atom to which they are bound, form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms. In some embodiments, said heterocyclic ring is selected from pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl. In other embodiments, said heterocyclic ring is selected from

In some embodiments, t is 1. In other embodiments, t is 0.

In other embodiments, R¹ is H or C₁-C₆alkyl; and R² is —(C₂-C₆alkyl)-Z. In some embodiments, R¹ is C₁-C₆alkyl. In some embodiments, Z is —NR³R⁴, wherein R³ and R⁴ are both C₁-C₂alkyl. In other embodiments, R³ and R⁴, taken together with the atom to which they are bound, form a ring selected from pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl. In some embodiments, said ring is pyrrolidinyl or piperidinyl.

In some embodiments, said ring is optionally substituted with one J^(Z1). In some embodiments, J^(Z1) is (X)_(r)—Z. In other embodiments, J^(Z1) is C₁₋₄alkyl or N(C₁₋₄alkyl)₂.

In one embodiment, p is 0, q is 0, and -L-NR¹R² is C(O)pyrrolidinyl, C(O)piperidinyl, C(O)piperazinyl, C(O)azepanyl, C(O)1,4-diazepanyl, C(O)NH-piperidinyl, C(O)NHCH₂CH₂-pyrrolidinyl, C(O)NHCH₂CH₂-piperidinyl, CON(CH₃)CH₂CH₂N(CH₃)₂, wherein said pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl is optionally substituted with C₁₋₄alkyl or N(C₁₋₄alkyl)₂. In one embodiment, -L-NR¹R² is C(O)1,4-diazepanyl.

Another embodiment provides a compound selected from Table IA:

TABLE IA

IA-1

IA-2

Another embodiment provides a compound of Formula IA-iii:

or a pharmaceutically acceptable salt thereof wherein;

Ring A is

-   J⁵o is H, F, Cl, C₁₋₄aliphatic, O(C₁₋₃aliphatic), or OH; -   J⁵p is

-   J⁵p1 is H, C₁₋₄aliphatic, oxetanyl, tetrahydrofuranyl,     tetrahydropyranyl; wherein J⁵p2 is optionally substituted with 1-2     occurrences of OH or halo; -   J⁵p2 is H, methyl, ethyl, CH₂F, CF₃, or CH₂OH; -   J²0 is H, CN, or SO₂CH₃; -   J²m is H, F, Cl, or methyl; -   J²p is —SO₂(C₁₋₆alkyl), —SO₂(C₃₋₆cycloalkyl), —SO₂(4-6 membered     heterocyclyl), —SO₂(C₁₋₄alkyl)N(C₁₋₄alkyl)₂, or —SO₂(C₁₋₄alkyl)-(4-6     membered heterocyclyl), wherein said heterocyclyl contains 1     heteroatom selected from the group consisting of O, N, and S; and     wherein said J²p is optionally substituted with 1-3 occurrences     halo, OH, or O(C₁₋₄alkyl).

In some embodiments, Ring A is

In other embodiments, Ring A is

Another embodiments provides a compound from one of the following Tables:

TABLE IA-2

IA-4

IA-5

IA-6

IA-7

IA-8

IA-9

IA-10

IA-11

IA-12

IA-13

IA-14

IA-15

IA-16

IA-17

IA-18

IA-19

IA-20

IA-21

IA-22

IA-23

IA-24

IA-25

IA-26

IA-27

IA-28

IA-29

IA-30

IA-31

IA-32

IA-33

IA-34

IA-35

IA-36

IA-37

IA-38

IA-39

IA-40

IA-41

IA-42

IA-43

IA-44

IA-45

IA-46

IA-47

IA-48

IA-49

IA-50

IA-51

IA-52

IA-53

IA-54

IA-55

IA-56

IA-57

IA-58

IA-59

IA-60

IA-61

IA-62

IA-63

IA-64

IA-65

IA-66

IA-67

IA-68

TABLE IA-3

IA-69

IA-70

IA-71

IA-72

IA-73

IA-74

IA-75

IA-76

IA-77

IA-78

IA-79

IA-80

IA-81

IA-82

IA-83

IA-84

IA-85

IA-86

IA-87

IA-88

IA-89

IA-90

IA-91

IA-92

IA-93

IA-94

IA-95

IA-96

IA-97

IA-98

IA-99

IA-100

IA-101

IA-102

IA-103

IA-104

IA-105

IA-106

IA-107

IA-108

IA-109

IA-110

IA-111

IA-112

IA-113

IA-114

IA-115

IA-116

IA-117

IA-118

IA-119

IA-120

IA-121

IA-122

IA-123

IA-124

IA-125

IA-126

IA-127

IA-128

IA-129

IA-130

IA-131

IA-132

IA-133

IA-134

IA-135

IA-136

IA-137

IA-138

IA-139

IA-140

IA-141

IA-142

IA-143

IA-144

IA-145

IA-146

IA-147

IA-148

IA-149

IA-150

IA-151

IA-152

IA-153

IA-154

IA-155

IA-156

IA-157

IA-158

IA-159

IA-160

IA-161

IA-162

IA-163

IA-164

IA-165

IA-166

IA-167

IA-168

IA-169

IA-170

IA-171

IA-172

IA-173

IA-174

IA-175

IA-176

IA-177

IA-178

IA-179

IA-180

IA-181

IA-182

IA-183

IA-184

IA-185

IA-186

IA-187

IA-188

IA-189

IA-190

IA-191

IA-192

IA-193

IA-194

IA-195

IA-196

IA-197

IA-198

IA-199

IA-200

IA-201

IA-202

IA-203

IA-204

IA-205

IA-206

IA-207

IA-208

IA-209

IA-210

IA-211

IA-212

IA-213

IA-214

IA-215

IA-216

IA-217

IA-218

IA-219

IA-220

IA-221

IA-222

IA-223

IA-224

IA-225

IA-226

IA-227

IA-228

IA-229

IA-230

IA-231

IA-232

IA-233

IA-234

IA-235

IA-236

IA-237

IA-238

IA-239

IA-240

IA-241

IA-242

IA-243

IA-244

IA-245

IA-246

IA-247

IA-248

IA-249

IA-250

IA-251

IA-252

IA-253

IA-254

IA-255

IA-256

IA-257

IA-258

IA-259

IA-260

IA-261

IA-262

IA-263

IA-264

IA-265

IA-266

IA-267

IA-268

IA-269

IA-270

IA-271

IA-272

IA-273

IA-274

IA-275

IA-276

IA-277

IA-278

IA-279

IA-280

IA-281

IA-282

IA-283

IA-284

IA-285

IA-286

IA-287

IA-288

IA-289

IA-290

IA-291

IA-292

IA-293

IA-294

IA-295

IA-296

IA-297

IA-298

IA-299

IA-300

IA-301

IA-302

IA-303

IA-304

IA-305

IA-306

IA-307

IA-308

IA-309

IA-310

IA-311

IA-312

IA-313

IA-314

IA-315

IA-316

IA-318

IA-319

IA-320

IA-321

IA-322

IA-323

IA-324

IA-325

IA-326

IA-327

IA-328

IA-329

IA-330

IA-331

IA-332

IA-333

IA-334

IA-335

IA-336

IA-337

IA-338

IA-339

IA-340

IA-341

IA-342

IA-343

IA-344

IA-345

IA-346

IA-347

IA-348

IA-349

TABLE IVA

IVA-1

IVA-2

IVA-3

TABLE IA-4 (part 1) Cmpd # Name P1 3-(5-(4-((2-fluoroethylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P2 3-(5-(4-((2-fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P3 3-(5-(4-((1-fluoropropan-2-ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P4 3-(5-(2-fluoro-4-((2-fluoroethylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5- (4-(tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P5 3-(5-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)- 5-(4-(tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P6 3-(5-(2-fluoro-4-((1-fluoropropan-2-ylamino)methyl)phenyl)-1,3,4-oxadiazol- 2-yl)-5-(4-(tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P7 3-(5-(2-fluoro-4-(((R)-tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)-5-(4-(tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P8 3-(5-(2-fluoro-4-(((S)-tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)-5-(4-(tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P9 3-(5-(4-(((S)-tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)- 5-(4-(tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P10 3-(5-(4-(((R)-tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)- 5-(4-(tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P11 5-(3-chloro-4-(tetrahydrofuran-3-ylsulfonyl)phenyl)-3-(5-(4-(((R)- tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2- amine P12 5-(3-chloro-4-(tetrahydrofuran-3-ylsulfonyl)phenyl)-3-(5-(2-fluoro-4-(((R)- tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2- amine P13 (R)-5-(4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)-3-(5-(4-((tetrahydrofuran- 3-ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P14 (S)-5-(4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)-3-(5-(4-((tetrahydrofuran- 3-ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P15 3-(5-(4-((ethylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4-(tetrahydro- 2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P16 (R)-3-(5-(2-fluoro-4-((tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)-5-(4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2- amine P17 (S)-3-(5-(2-fluoro-4-((tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)-5-(4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2- amine P18 3-(5-(4-((ethylamino)methyl)-2-fluorophenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P19 3-(5-(2-fluoro-4-((2-fluoroethylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5- (4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P20 3-(5-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)- 5-(4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P21 3-(5-(2-fluoro-4-((1-fluoropropan-2-ylamino)methyl)phenyl)-1,3,4-oxadiazol- 2-yl)-5-(4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P22 3-(5-(4-((2-fluoroethylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P23 3-(5-(4-((2-fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P24 3-(5-(4-((1-fluoropropan-2-ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P25 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(4-((2-fluoroethylamino)methyl)phenyl)- 1,3,4-oxadiazol-2-yl)pyrazin-2-amine P26 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(4-((2-fluoropropylamino)methyl)phenyl)- 1,3,4-oxadiazol-2-yl)pyrazin-2-amine P27 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(4-((1-fluoropropan-2- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P28 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(2-fluoro-4-((2- fluoroethylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P29 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(2-fluoro-4-((2- fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P30 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(2-fluoro-4-((1-fluoropropan-2- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P31 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(2-fluoro-4-(((R)-tetrahydrofuran-3- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P32 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(2-fluoro-4-(((S)-tetrahydrofuran-3- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P33 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(2-fluoro-4-(((R)-2- fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P34 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(4-(((R)-tetrahydrofuran-3- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P35 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(4-(((S)-tetrahydrofuran-3- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P36 5-(4-(sec-butylsulfonyl)phenyl)-3-(5-(4-(((R)-2- fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P37 (R)-5-(4-(isopropylsulfonyl)phenyl)-3-(5-(4-((tetrahydrofuran-3- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P38 (S)-5-(4-(isopropylsulfonyl)phenyl)-3-(5-(4-((tetrahydrofuran-3- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P39 (R)-3-(5-(4-((2-fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P40 (R)-3-(5-(2-fluoro-4-((tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)-5-(4-(isopropylsulfonyl)phenyl)pyrazin-2-amine P41 (S)-3-(5-(2-fluoro-4-((tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)-5-(4-(isopropylsulfonyl)phenyl)pyrazin-2-amine P42 (R)-3-(5-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2- yl)-5-(4-(isopropylsulfonyl)phenyl)pyrazin-2-amine P43 3-(5-(2-fluoro-4-((2-fluoroethylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5- (4-(isopropylsulfonyl)phenyl)pyrazin-2-amine P44 3-(5-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)- 5-(4-(isopropylsulfonyl)phenyl)pyrazin-2-amine P45 3-(5-(2-fluoro-4-((1-fluoropropan-2-ylamino)methyl)phenyl)-1,3,4-oxadiazol- 2-yl)-5-(4-(isopropylsulfonyl)phenyl)pyrazin-2-amine P46 5-(3-chloro-4-(isopropylsulfonyl)phenyl)-3-(5-(4-((2- fluoroethylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P47 3-(5-(4-((2-fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P48 3-(5-(4-((1-fluoropropan-2-ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P49 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(5-(4-((2- fluoroethylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P50 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(5-(4-((2- fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P51 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(5-(4-((1-fluoropropan-2- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P52 3-(5-(2-fluoro-4-((2-fluoroethylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5- (4-(4-fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P53 3-(5-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)- 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P54 3-(5-(2-fluoro-4-((1-fluoropropan-2-ylamino)methyl)phenyl)-1,3,4-oxadiazol- 2-yl)-5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P55 3-(5-(2-fluoro-4-(((R)-tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)-5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P56 3-(5-(2-fluoro-4-(((S)-tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)-5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P57 3-(5-(2-fluoro-4-((methylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4-(4- fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P58 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(5-(4-(((R)-tetrahydrofuran-3- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P59 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(5-(4-(((S)-tetrahydrofuran-3- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P60 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(5-(4- ((methylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine P61 3-(4-(5-amino-6-(5-(4-(((R)-tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P62 3-(4-(5-amino-6-(5-(4-(((S)-tetrahydrofuran-3-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P63 3-(4-(5-amino-6-(5-(4-((methylamino)methyl)phenyl)-1,3,4-oxadiazol-2- yl)pyrazin-2-yl)-2-fluorophenylsulfonyl)butan-1-ol P64 3-(4-(5-amino-6-(5-(2-fluoro-4-(((R)-tetrahydrofuran-3- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2- yl)phenylsulfonyl)butan-1-ol P65 3-(4-(5-amino-6-(5-(2-fluoro-4-(((S)-tetrahydrofuran-3- ylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2- yl)phenylsulfonyl)butan-1-ol P66 3-(4-(5-amino-6-(5-(2-fluoro-4-((methylamino)methyl)phenyl)-1,3,4-oxadiazol- 2-yl)pyrazin-2-yl)-2-fluorophenylsulfonyl)butan-1-ol P67 3-(4-(5-amino-6-(5-(2-fluoro-4-((2-fluoroethylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P68 3-(4-(5-amino-6-(5-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P69 3-(4-(5-amino-6-(5-(2-fluoro-4-((1-fluoropropan-2-ylamino)methyl)phenyl)- 1,3,4-oxadiazol-2-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P70 3-(4-(5-amino-6-(5-(4-((2-fluoroethylamino)methyl)phenyl)-1,3,4-oxadiazol-2- yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P71 3-(4-(5-amino-6-(5-(4-((2-fluoropropylamino)methyl)phenyl)-1,3,4-oxadiazol- 2-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P72 3-(4-(5-amino-6-(5-(4-((1-fluoropropan-2-ylamino)methyl)phenyl)-1,3,4- oxadiazol-2-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P73 3-(3-(4-((2-fluoroethylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P74 3-(3-(4-((2-fluoropropylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P75 3-(3-(4-((1-fluoropropan-2-ylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P76 3-(3-(2-fluoro-4-((2-fluoroethylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P77 3-(3-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P78 3-(3-(2-fluoro-4-((1-fluoropropan-2-ylamino)methyl)phenyl)isoxazol-5-yl)-5- (4-(tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P79 3-(3-(2-fluoro-4-(((S)-tetrahydrofuran-2-ylamino)methyl)phenyl)isoxazol-5-yl)- 5-(4-(tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P80 3-(3-(2-fluoro-4-(((S)-tetrahydrofuran-3-ylamino)methyl)phenyl)isoxazol-5-yl)- 5-(4-(tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P81 3-(3-(4-((ethylamino)methyl)-2-fluorophenyl)isoxazol-5-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P82 3-(3-(4-(((S)-tetrahydrofuran-2-ylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P83 3-(3-(4-(((S)-tetrahydrofuran-3-ylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P84 3-(3-(4-((methylamino)methyl)phenyl)isoxazol-5-yl)-5-(4-(tetrahydrofuran-3- ylsulfonyl)phenyl)pyrazin-2-amine P85 (S)-5-(4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)-3-(3-(4-((tetrahydrofuran- 2-ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P86 (S)-5-(4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)-3-(3-(4-((tetrahydrofuran- 3-ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P87 3-(3-(4-((methylamino)methyl)phenyl)isoxazol-5-yl)-5-(4-(tetrahydro-2H- pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P88 (S)-3-(3-(2-fluoro-4-((tetrahydrofuran-2-ylamino)methyl)phenyl)isoxazol-5-yl)- 5-(4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P89 (S)-3-(3-(2-fluoro-4-((tetrahydrofuran-3-ylamino)methyl)phenyl)isoxazol-5-yl)- 5-(4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P90 3-(3-(2-fluoro-4-((methylamino)methyl)phenyl)isoxazol-5-yl)-5-(4-(tetrahydro- 2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P91 3-(3-(2-fluoro-4-((fluoromethylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P92 3-(3-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P93 3-(3-(2-fluoro-4-((1-fluoropropan-2-ylamino)methyl)phenyl)isoxazol-5-yl)-5- (4-(tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P94 3-(3-(4-((fluoromethylamino)methyl)phenyl)isoxazol-5-yl)-5-(4-(tetrahydro- 2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P95 3-(3-(4-((2-fluoropropylamino)methyl)phenyl)isoxazol-5-yl)-5-(4-(tetrahydro- 2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P96 3-(3-(4-((1-fluoropropan-2-ylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (tetrahydro-2H-pyran-4-ylsulfonyl)phenyl)pyrazin-2-amine P97 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(4- ((fluoromethylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P98 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(4-((2- fluoropropylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P99 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(4-((1-fluoropropan-2- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P100 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(2-fluoro-4- ((fluoromethylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P101 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(2-fluoro-4-((2- fluoropropylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P102 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(2-fluoro-4-((1-fluoropropan-2- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P103 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(2-fluoro-4-(((R)-tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P104 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(2-fluoro-4-(((S)-tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P105 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(2-fluoro-4- ((methylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P106 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(4-(((R)-tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P107 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(4-(((S)-tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P108 5-(4-(sec-butylsulfonyl)phenyl)-3-(3-(4- ((methylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P109 (R)-5-(4-(isopropylsulfonyl)phenyl)-3-(3-(4-((tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P110 (S)-5-(4-(isopropylsulfonyl)phenyl)-3-(3-(4-((tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P111 5-(3-chloro-4-(isopropylsulfonyl)phenyl)-3-(3-(4- ((methylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P112 (R)-3-(3-(2-fluoro-4-((tetrahydrofuran-3-ylamino)methyl)phenyl)isoxazol-5- yl)-5-(4-(isopropylsulfonyl)phenyl)pyrazin-2-amine P113 (S)-3-(3-(2-fluoro-4-((tetrahydrofuran-3-ylamino)methyl)phenyl)isoxazol-5-yl)- 5-(4-(isopropylsulfonyl)phenyl)pyrazin-2-amine P114 3-(3-(2-fluoro-4-((methylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P115 3-(3-(2-fluoro-4-((2-fluoroethylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P116 3-(3-(2-fluoro-4-((1-fluoropropan-2-ylamino)methyl)phenyl)isoxazol-5-yl)-5- (4-(isopropylsulfonyl)phenyl)pyrazin-2-amine P117 3-(3-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P118 3-(3-(4-((2-fluoroethylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P119 3-(3-(4-((1-fluoropropan-2-ylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P120 3-(3-(4-((2-fluoropropylamino)methyl)phenyl)isoxazol-5-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P121 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(3-(4-((2- fluoroethylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P122 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(3-(4-((1-fluoropropan-2- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P123 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(3-(4-((2- fluoropropylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P124 3-(3-(2-fluoro-4-((2-fluoroethylamino)methyl)phenyl)isoxazol-5-yl)-5-(4-(4- fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P125 3-(3-(2-fluoro-4-((1-fluoropropan-2-ylamino)methyl)phenyl)isoxazol-5-yl)-5- (4-(4-fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P126 3-(3-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)isoxazol-5-yl)-5-(4-(4- fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P127 3-(3-(2-fluoro-4-(((R)-tetrahydrofuran-3-ylamino)methyl)phenyl)isoxazol-5- yl)-5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P128 3-(3-(2-fluoro-4-(((S)-tetrahydrofuran-3-ylamino)methyl)phenyl)isoxazol-5-yl)- 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P129 3-(3-(2-fluoro-4-((methylamino)methyl)phenyl)isoxazol-5-yl)-5-(4-(4- fluorobutan-2-ylsulfonyl)phenyl)pyrazin-2-amine P130 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(3-(4-(((R)-tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P131 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(3-(4-(((S)-tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P132 5-(4-(4-fluorobutan-2-ylsulfonyl)phenyl)-3-(3-(4- ((methylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine P133 3-(4-(5-amino-6-(3-(4-(((R)-tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P134 3-(4-(5-amino-6-(3-(4-(((S)-tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P135 3-(4-(5-amino-6-(3-(4-((methylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2- yl)phenylsulfonyl)butan-1-ol P136 3-(4-(5-amino-6-(3-(2-fluoro-4-(((R)-tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P137 3-(4-(5-amino-6-(3-(2-fluoro-4-(((S)-tetrahydrofuran-3- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P138 3-(4-(5-amino-6-(3-(2-fluoro-4-((methylamino)methyl)phenyl)isoxazol-5- yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P139 3-(4-(5-amino-6-(3-(2-fluoro-4-((2-fluoroethylamino)methyl)phenyl)isoxazol- 5-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P140 3-(4-(5-amino-6-(3-(2-fluoro-4-((1-fluoropropan-2- ylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P141 3-(4-(5-amino-6-(3-(2-fluoro-4-((2-fluoropropylamino)methyl)phenyl)isoxazol- 5-yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P142 3-(4-(5-amino-6-(3-(4-((2-fluoroethylamino)methyl)phenyl)isoxazol-5- yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P143 3-(4-(5-amino-6-(3-(4-((1-fluoropropan-2-ylamino)methyl)phenyl)isoxazol-5- yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P144 3-(4-(5-amino-6-(3-(4-((2-fluoropropylamino)methyl)phenyl)isoxazol-5- yl)pyrazin-2-yl)phenylsulfonyl)butan-1-ol P145 3-(3-(4-(1-amino-2,2-difluoroethyl)phenyl)isoxazol-5-yl)-5-(4-(sec- butylsulfonyl)phenyl)pyrazin-2-amine P146 3-(5-(4-(1-amino-2,2-difluoroethyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P147 3-(3-(4-(1-amino-2,2-difluoroethyl)-2-fluorophenyl)isoxazol-5-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine P148 3-(3-(4-(1-amino-2-fluoroethyl)phenyl)isoxazol-5-yl)-5-(4-(sec- butylsulfonyl)phenyl)pyrazin-2-amine P149 3-(5-(4-(1-amino-2-fluoroethyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4- (isopropylsulfonyl)phenyl)pyrazin-2-amine P150 3-(3-(4-(1-amino-2-fluoroethyl)-2-fluorophenyl)isoxazol-5-yl)-5-(4- (tetrahydrofuran-3-ylsulfonyl)phenyl)pyrazin-2-amine

TABLE IA-4 (part 2)

P1

P2

P3

P4

P5

P6

P7

P8

P9

P10

P11

P12

P13

P14

P15

P16

P17

P18

P19

P20

P21

P22

P23

P24

P25

P26

P27

P28

P29

P30

P31

P32

P33

P34

P35

P36

P37

P38

P39

P40

P41

P42

P43

P44

P45

P46

P47

P48

P49

P50

P51

P52

P53

P54

P55

P56

P57

P58

P59

P60

P61

P62

P63

P64

P65

P66

P67

P68

P69

P70

P71

P72

P73

P74

P75

P76

P77

P78

P79

P80

P81

P82

P83

P84

P85

P86

P87

P88

P89

P90

P91

P92

P93

P94

P95

P96

P97

P98

P99

P100

P101

P102

P103

P104

P105

P106

P107

P108

P109

P110

P111

P112

P113

P114

P115

P116

P117

P118

P119

P120

P121

P122

P123

P124

P125

P126

P127

P128

P129

P130

P131

P132

P133

P134

P135

P136

P137

P138

P139

P140

P141

P142

P143

P144

P145

P146

P147

P148

P149

P150

Another aspect provides a compound of formula II,

or a pharmaceutically acceptable salt thereof; wherein

-   Ring A is a 5-6 membered monocyclic aromatic ring containing 0-2     heteroatoms selected from N, O, or S; Ring A is optionally fused to     a 5-6 membered aromatic ring containing 0-2 heteroatoms selected     from N, O, or S; -   L is —C(O)—; -   R¹ is C₁-C₆alkyl; -   R² is —(C₂-C₆alkyl)-Z or a 4-8 membered heterocyclic ring containing     0-2 nitrogen atoms; wherein said ring is bonded via a carbon atom     and is optionally substituted with one occurrence of J^(Z); -   or R¹ and R², taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said heterocyclic ring is optionally substituted with one     occurrence of J^(Z1); -   J^(Z1) is —(X)_(t)—CN, C₁-C₆alkyl or —(X)_(t)—Z; -   X is C₁-C₄alkyl; -   each t, p, and r is independently 0 or 1; -   Z is —NR³R⁴; -   R³ is H or C₁-C₂alkyl; -   R⁴ is H or C₁-C₆alkyl; -   or R³ and R⁴, taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said ring is optionally substituted with one occurrence of     J^(Z); -   each J^(Z) and J¹ is independently NH₂, NH(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic),     NO₂, CN, CO₂H, CO₂ (C₁₋₄aliphatic), O(haloC₁₋₄aliphatic), or     haloC₁₋₄aliphatic; -   J² is halo, C₁-C₂alkyl optionally substituted with 1-3 fluoro, or     CN; -   q is 0, 1, or 2.

In some embodiments, when Ring A is

and R¹ is H; then R² is not

In some embodiments, Ring A is a 6-membered ring not fused to another ring. In other embodiments, Ring A is phenyl, pyridyl, or pyrimidyl. In yet other embodiments, Ring A is phenyl.

In some embodiments, R¹ and R², taken together with the atom to which they are bound, form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms. In some embodiments, said heterocyclic ring is selected from pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl. In other embodiments, said heterocyclic ring is selected from

In yet other embodiments, the ring formed by R¹ and R² is optionally substituted with CH₂pyrrolidinyl, C₁₋₄alkyl, N(C₁₋₄alkyl)₂, or CH₂CH₂CN.

In some embodiments, t is 1. In other embodiments, t is 0.

In other embodiments, R¹ is H or C₁-C₆alkyl; and R² is —(C₂-C₆alkyl)-Z.

In some embodiments, Z is —NR³R⁴, wherein R³ and R⁴ are both C₁-C₂alkyl. In other embodiments, R³ and R⁴, taken together with the atom to which they are bound, form a ring selected from pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl. In some embodiments, said ring is pyrrolidinyl or piperidinyl.

In some embodiments, said ring is optionally substituted with one J^(Z). In some embodiments, J^(Z) is C₁₋₄alkyl or N(C₁₋₄alkyl)₂.

In one embodiment, p is 0, q is 0, and -L-NR¹R² is C(O)pyrrolidinyl, C(O)piperidinyl, C(O)piperazinyl, C(O)azepanyl, C(O)1,4-diazepanyl, CON(CH₃)CH₂CH₂N(CH₃)₂, wherein said pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl is optionally substituted with CH₂pyrrolidinyl, C₁₋₄alkyl, N(C₁₋₄alkyl)₂, or CH₂CH₂CN.

Another embodiment provides a compound selected from Table II.

TABLE II

II-1

II-2

II-3

II-4

II-5

II-6

II-7

II-8

II-9

II-10

II-11

Another aspect provides a compound of formula III:

or a pharmaceutically acceptable salt thereof; wherein

-   L is —C(O)— or —SO₂—; -   R¹ is H, or C₁-C₆alkyl; -   R² is —(C₂-C₆alkyl)-Z or a 4-8 membered heterocyclic ring containing     0-2 nitrogen atoms; wherein said ring is bonded via a carbon atom     and is optionally substituted with one occurrence of J^(Z); -   or R¹ and R², taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said heterocyclic ring is optionally substituted with one     occurrence of J^(Z1); -   J^(Z1) is —(X)_(t)—CN, C₁-C₆alkyl or —(X)_(t)—Z; -   X is C₁-C₄alkyl; -   each t, p, and r is independently 0 or 1; -   Z is —NR³R⁴; -   R³ is H or C₁-C₂alkyl; -   R⁴ is H or C₁-C₆alkyl; -   or R³ and R⁴, taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said ring is optionally substituted with one occurrence of     J^(Z); -   each J^(Z) and J¹ is independently NH₂, NH(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic),     NO₂, CN, CO₂H, CO(C₁₋₄aliphatic), CO₂(C₁₋₄aliphatic),     O(haloC₁₋₄aliphatic), or haloC₁₋₄aliphatic; -   J² is halo, C₁-C₂alkyl optionally substituted with 1-3 fluoro, or     CN; -   q is 0, 1, or 2.

In some embodiments, J¹ is J^(1a) or J^(1b) as depicted in Formula III-i.

In some embodiments, when L is —C(O)—, q is 0, J^(1a) is H, and J^(1b) is H or F; then:

-   -   when R¹ is H; then R² is not —(C₁₋₄alkyl)-N(CH₃)₂; or     -   R¹ and R² taken together are not

In some embodiments, R¹ and R², taken together with the atom to which they are bound, form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms. In some embodiments, said heterocyclic ring is selected from pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl. In other embodiments, said heterocyclic ring is selected from

In some embodiments, t is 1. In other embodiments, t is 0.

In other embodiments, R¹ is H or C₁-C₆alkyl; and R² is —(C₂-C₆alkyl)-Z. In some embodiments, Z is —NR³R⁴, wherein R³ and R⁴ are both C₁-C₂alkyl. In other embodiments, R³ and R⁴, taken together with the atom to which they are bound, form a ring selected from pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl. In some embodiments, said ring is pyrrolidinyl or piperidinyl.

In some embodiments, said ring is optionally substituted with one J^(Z). In some embodiments, J^(Z) is C₁₋₄alkyl or N(C₁₋₄alkyl)₂.

In one embodiment, p is 0, q is 0, and -L-NR¹R² is C(O)pyrrolidinyl, C(O)piperidinyl, C(O)piperazinyl, C(O)azepanyl, C(O)1,4-diazepanyl, C(O)NH-piperidinyl, C(O)NHCH₂CH₂-pyrrolidinyl, C(O)NHCH₂CH₂-piperidinyl, CON(CH₃)CH₂CH₂N(CH₃)₂, wherein said pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl is optionally substituted with C₁₋₄alkyl or N(C₁₋₄alkyl)₂.

Another embodiment provides a compound selected from Table III:

TABLE III

Compound No. NR¹R² J¹ III-1

CH₃ III -2

CH₃ III -3

CH₃ III -4

CH₃ III -5

CH₃ III -6

H.

Another aspect provides a compound selected from Table III-2:

TABLE III-2

Compound No. NR¹R² J^(1b) J^(1a) J^(2a) J^(2b) III-7

H CH₃ H H III-8

H H H H III-9

H CH₃ H H III-10

H F H H III-11

OCH₃ H H H III-12

H H F H III-13

H CH₃ H F III-14

H F H H III-15

H H H H III-16

H CH₃ H H III-17

OCH₃ H H H III-18

H F H H III-19

H H F H III-20

H CH₃ H F III-21

H F H H III-22

H F H H III-23

H CH₃ H H III-24

OCH₃ H H H III-25

H CH₃ H F III-26

H F H H III-27

H CH₃ H F III-28

CF₃ H H H III-29

CF₃ H H H III-30

H H H H III-31

OCH₃ H H H III-32

H H H H III-33

H H F H III-34

CF₃ H H H III-35

H H F H

Another aspect provides a compound of Formula V:

or a pharmaceutically acceptable salt thereof: wherein

-   Ring A is a 8-9 membered bicyclic heteroaryl ring having 1-4     heteroatoms selected from the group consisting of oxygen, nitrogen,     and sulfur; -   Q is a 5-6 membered monocyclic aromatic ring containing 0-3     heteroatoms independently selected from the group consisting of     nitrogen, oxygen, and sulfur; -   L is C₁₋₄alkyl chain wherein up to two methylene units of the alkyl     chain are optionally replaced with O, NR⁶, S, —C(O)—, —SO—, or     —SO₂—; -   R¹ is H or C₁-C₆alkyl; -   R² is H, C₁-C₆alkyl, —(C₂-C₆alkyl)-Z, or a 3-8 membered cyclic ring     containing 0-2 nitrogen atoms; wherein said ring is bonded via a     carbon atom and is optionally substituted with one occurrence of     J^(Z); -   or R¹ and R², taken together with the atom to which they are bound,     form a 3-8 membered monocyclic or 8-9 membered bicyclic heterocyclic     ring containing 1-2 heteroatoms selected the group consisting of     oxygen, nitrogen, and sulfur; wherein said heterocyclic ring is     optionally substituted with one occurrence of J^(Z1); -   J^(Z1) is —(X)_(t)—CN, C₁-C₆alkyl or —(X)_(r)—Z; -   X is C₁₋₄alkyl; -   Z is —NR³R⁴; -   R³ is H or C₁-C₂alkyl; -   R⁴ is H or C₁-C₆alkyl; -   or R³ and R⁴, taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said ring is optionally substituted with one occurrence of     J^(Z); -   Z¹ is —NR⁵R⁶; -   R⁵ is H or C₁-C₂alkyl; -   R⁶ is H or C₁-C₆alkyl; -   or R⁵ and R⁶, taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said ring is optionally substituted with one occurrence of     J^(Z1); -   J¹ is halo, CN, or a C₁₋₆aliphatic group wherein up to 2 methylene     units are optionally replaced with O, NR″, C(O), S, S(O), or S(O)₂;     said C₁₋₆aliphatic group is optionally substituted with 1-3 fluoro     or CN; -   J² is halo; CN; or a C₁₋₆aliphatic group wherein up to 2 methylene     units are optionally replaced with O, NR″, C(O), S, S(O), or S(O)₂;     said C₁₋₆aliphatic group is optionally substituted with 1-3 fluoro     or CN; -   each J^(Z) and J^(Z1) is independently NH₂, NH(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic),     NO₂, CN, CO₂H, CO(C₁₋₄aliphatic), CO₂(C₁₋₄aliphatic),     O(haloC₁₋₄aliphatic), or haloC₁₋₄aliphatic; -   each q and m is independently 0, 1, or 2; -   each t, p, and r is independently 0 or 1.

According to one embodiment, Ring A is a 9-membered ring. In some embodiments, Ring A is a 5-6 bicyclic ring system. A 5-6 bicyclic system is a five-membered ring fused to a six membered ring as shown below.

Examples of 5-6 bicyclic systems include, but are not limited to, benzimidazolyl, benzoxazolyl, indazolyl, pyrrolopyridinyl, pyrrolopyrimidinyl, pyrrolopyrazinyl, benzothiazolyl, benzothiophenyl, indolyl, benzofuranyl, benzotriazolyl, and azaindolyl.

In some embodiments, Ring A has 1-2 heteroatoms. In some embodiments, Ring A is benzimidazolyl, benzoxazolyl, indazolyl, benzothiazolyl, indolyl, benzotriazolyl, or azaindolyl.

According to another embodiment, Ring Q is phenyl or pyridyl. In some embodiment, Q is phenyl.

In some embodiments, p is 1 and Ring Q is substituted in the para position with L-NR¹R² as shown in formula V-a:

In some embodiments, L is C(O) or S(O)₂. In other embodiments, R¹ and R² are both C₁₋₄alkyl. In yet other embodiments, R¹ and R², taken together with the atom to which they are bound, form a 4-7 membered heterocyclic ring containing 1-2 nitrogen atoms. In some embodiments, said heterocyclic ring is selected from the group consisting of pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, and 1,4-diazepanyl. In some embodiments, said heterocyclyl is 1,4-diazepanyl.

In other embodiments, Ring Q is pyridyl.

In some embodiments, p is 0. In other embodiments, q is 1 and J² is CN.

Another embodiment provides a compound selected from Table V:

TABLE V

V-1

V-2

V-3

V-4

V-5

V-6

V-7

V-8

V-9

V-10

V-11

V-12

V-13

V-14

V-15

V-16

V-17

TABLE V-2

Com- pound No. Ring A J² LNR¹R² V-18

H SO₂CH₃ V-19

H SO₂CH₃ V-20

H SO₂CH₃ V-21

H CON(CH₃)₂ V-22

H

V-23

H

V-24

H

V-25

H

V-26

H

V-27

H

V-28

H

V-29

CN

V-30

Another embodiment provides a compound of formula VI:

or a pharmaceutically acceptable salt thereof; wherein

-   Q is a 5-6 membered monocyclic aromatic ring containing 0-4     heteroatoms independently selected from nitrogen, oxygen, or sulfur;     or an 8-10 membered bicyclic aromatic ring containing 0-6     heteroatoms independently selected from nitrogen, oxygen, or sulfur; -   L is —C(O)— or —SO₂—; -   G is S or O; -   R¹ is H, or C₁-C₆alkyl; -   R² is —(C₂-C₆alkyl)-Z or a 4-8 membered heterocyclic ring containing     0-2 nitrogen atoms; wherein said ring is bonded via a carbon atom     and is optionally substituted with one occurrence of J^(Z); -   or R¹ and R², taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said heterocyclic ring is optionally substituted with one     occurrence of J^(Z1); -   J^(Z1) is —(X)_(t)—CN, C₁-C₆alkyl or —(X)_(t)—Z; -   X is C₁-C₄alkyl; -   each t, p, and r is independently 0 or 1; -   Z is —NR³R⁴; -   R³ is H or C₁-C₂alkyl; -   R⁴ is H or C₁-C₆alkyl; -   or R³ and R⁴, taken together with the atom to which they are bound,     form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms;     wherein said ring is optionally substituted with one occurrence of     J^(Z); -   each J^(Z) and J¹ is independently NH₂, NH(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic),     NO₂, CN, CO₂H, CO(C₁₋₄aliphatic), CO₂(C₁₋₄aliphatic),     O(haloC₁₋₄aliphatic), or haloC₁₋₄aliphatic; -   J² is halo, C₁-C₂alkyl optionally substituted with 1-3 fluoro, or     CN; -   q is 0, 1, or 2; -   p is 0 or 1.

According to one aspect of the invention, p is 1. In some embodiments, Q is phenyl. In other embodiments, L is —C(O)—. In some embodiments, R¹ and R², taken together with the atom to which they are bound, form a 4-8 membered heterocyclic ring containing 1-2 nitrogen atoms. In some embodiments, the heterocyclic ring formed by R¹ and R² is selected from pyrrolidinyl, piperidinyl, piperazinyl, azepanyl, or 1,4-diazepanyl. In other embodiments, said heterocyclyl is

According to another aspect of the invention, p is 0, q is 0, and -L-NR¹R² is C(O)1,4-diazepanyl.

Another embodiment provides a compound selected from Table VI:

TABLE VI

Compound No. NR¹R² G VI-1

S VI-2

O VI-3

S

Another embodiment provides a compound of formula VII,

or a pharmaceutically acceptable salt thereof; wherein

-   Ring A is a 5-6 membered monocyclic aryl or heteroaryl ring having     0-3 heteroatoms independently selected from nitrogen, oxygen, or     sulfur, wherein said ring is optionally substituted with J¹; -   R¹ is C₁-C₆alkyl; -   J¹ is a C₁₋₆ alkyl chain wherein 1-2 methylene units are optionally     replaced with O, NR*, S, or C(O); J¹ is optionally substituted with     1-3 occurrences of halo; -   R* is H or C₁₋₄alkyl; -   J² is halo, C₁-C₂alkyl optionally substituted with 1-3 fluoro, or     CN; -   Each p and q is independently 0, 1, or 2.

According to one aspect of the invention, Ring A is a 5-6 membered heteroaryl having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur. In some embodiments, Ring A is pyridinyl, pyrimidyl, pyrazinyl, triazinyl, pyrrolyl, pyrazolyl, triazolyl, thienyl, thiazolyl, thiadiazolyl, furanyl, oxazolyl, or oxadiaozolyl. In other embodiments, Ring A is pyridinyl, pyrazolyl, thiadiazolyl, or thiazolyl wherein Ring A is optionally substituted with halo or C₁₋₄alkyl. In some embodiments, Ring A is phenyl. In some embodiments, said phenyl is substituted with one occurrence of J.

In some embodiments, J¹ is a C₁₋₆ alkyl chain wherein 1 methylene unit is replaced with N or O. In other embodiments, J¹ is O(C₁₋₄alkyl) or —(C₁₋₄alkyl)NH(C₁₋₄alkyl). In yet other embodiments, J¹ is —(C₁₋₄alkyl)NH(C₁₋₄alkyl).

Another embodiment provides a compound selected from the following:

TABLE VII

Compound No. R1

VII-1 CH₃

VII-2 CH₃

VII-3 CH₃

VII-4 CH₃

VII-5 CH₃

VII-6 CH₃

VII-7 CH₃

VII-8 CH₃

VII-9 CH₃

VII-10 CH₃

VII-11 CH(CH₃)₂

VII-12 CH(CH₃)₂

VII-13 CH₃

Another embodiment provides a compound selected from Table 1.

TABLE I

I-1

I-2

I-3

I-4

I-5

I-6

I-7

I-8

I-9

I-10

I-11

I-12

I-13

I-14

I-15

I-16

I-17

I-18

I-19

I-20

I-21

I-22

I-23

I-24

I-25

I-26

I-27

I-28

I-29

I-30

I-31

I-32

I-33

I-34

I-35

I-36

I-37

I-38

I-39

I-40

I-41

I-42

I-43

I-44

I-45

I-46

I-47

I-48

I-49

I-50

I-51

I-52

I-53

I-54

I-55

I-56

I-57

I-58

I-59

I-60

I-61

I-62

I-63

I-64

I-65

I-66

I-67

I-68

I-69

I-70

I-71

I-72

I-73

I-74

I-75

I-76

I-77

I-78

I-79

I-80

I-81

I-82

I-83

I-84

I-85

I-86

I-87

I-88

I-89

I-90

I-91

I-92

I-93

I-94

I-95

I-96

I-97

I-98

I-99

I-100

I-101

I-102

I-103

I-104

I-105

I-106

I-107

I-108

I-109

I-110

I-111

I-112

I-113

I-114

I-115

I-116

I-117

I-118

I-119

I-120

I-121

I-122

I-123

I-124

I-125

I-126

I-127

I-128

I-129

I-130

I-131

I-132

I-133

I-134

I-135

I-136

I-137

I-138

I-139

I-140

I-141

I-142

I-143

I-144

I-145

I-146

I-147

I-148

I-149

I-150

I-151

I-152

I-153

In some embodiments, the variables are as depicted in the compounds of the disclosure including compounds in the tables above.

Compounds of this invention include those described generally herein, and are further illustrated by the classes, subclasses, and species disclosed herein. As used herein, the following definitions shall apply unless otherwise indicated. For purposes of this invention, the chemical elements are identified in accordance with the Periodic Table of the Elements, CAS version, Handbook of Chemistry and Physics, 75^(th) Ed. Additionally, general principles of organic chemistry are described in “Organic Chemistry”, Thomas Sorrell, University Science Books, Sausalito: 1999, and “March's Advanced Organic Chemistry”, 5^(th) Ed., Ed.: Smith, M. B. and March, J., John Wiley & Sons, New York: 2001, the entire contents of which are hereby incorporated by reference.

As described herein, a specified number range of atoms includes any integer therein. For example, a group having from 1-4 atoms could have 1, 2, 3, or 4 atoms.

As described herein, compounds of the invention may optionally be substituted with one or more substituents, such as are illustrated generally herein, or as exemplified by particular classes, subclasses, and species of the invention. It will be appreciated that the phrase “optionally substituted” is used interchangeably with the phrase “substituted or unsubstituted.” In general, the term “substituted”, whether preceded by the term “optionally” or not, refers to the replacement of hydrogen radicals in a given structure with the radical of a specified substituent. Unless otherwise indicated, an optionally substituted group may have a substituent at each substitutable position of the group, and when more than one position in any given structure may be substituted with more than one substituent selected from a specified group, the substituent may be either the same or different at every position. Combinations of substituents envisioned by this invention are preferably those that result in the formation of stable or chemically feasible compounds.

Unless otherwise indicated, a substituent connected by a bond drawn from the center of a ring means that the substituent can be bonded to any position in the ring. In example i below, for instance, J¹ can be bonded to any position on the pyridyl ring. For bicyclic rings, a bond drawn through both rings indicates that the substituent can be bonded from any position of the bicyclic ring. In example ii below, for instance, J¹ can be bonded to the 5-membered ring (on the nitrogen atom, for instance), and to the 6-membered ring.

The term “stable”, as used herein, refers to compounds that are not substantially altered when subjected to conditions to allow for their production, detection, recovery, purification, and use for one or more of the purposes disclosed herein. In some embodiments, a stable compound or chemically feasible compound is one that is not substantially altered when kept at a temperature of 40° C. or less, in the absence of moisture or other chemically reactive conditions, for at least a week.

The term “aliphatic” or “aliphatic group”, as used herein, means a straight-chain (i.e., unbranched), branched, or cyclic, substituted or unsubstituted hydrocarbon chain that is completely saturated or that contains one or more units of unsaturation that has a single point of attachment to the rest of the molecule.

Unless otherwise specified, aliphatic groups contain 1-20 aliphatic carbon atoms. In some embodiments, aliphatic groups contain 1-10 aliphatic carbon atoms. In other embodiments, aliphatic groups contain 1-8 aliphatic carbon atoms. In still other embodiments, aliphatic groups contain 1-6 aliphatic carbon atoms, and in yet other embodiments aliphatic groups contain 1-4 aliphatic carbon atoms. Aliphatic groups may be linear or branched, substituted or unsubstituted alkyl, alkenyl, or alkynyl groups. Specific examples include, but are not limited to, methyl, ethyl, isopropyl, n-propyl, sec-butyl, vinyl, n-butenyl, ethynyl, and tert-butyl.

The term “cycloaliphatic” (or “carbocycle” or “carbocyclyl”) refers to a monocyclic C₃-C₈ hydrocarbon or bicyclic C₈-C₁₂ hydrocarbon that is completely saturated or that contains one or more units of unsaturation, but which is not aromatic, that has a single point of attachment to the rest of the molecule wherein any individual ring in said bicyclic ring system has 3-7 members. Examples of cycloaliphatic groups include, but are not limited to, cycloalkyl and cycloalkenyl groups. Specific examples include, but are not limited to, cyclohexyl, cyclopropenyl, and cyclobutyl.

The term “heterocycle”, “heterocyclyl”, or “heterocyclic” as used herein means non-aromatic, monocyclic, bicyclic, or tricyclic ring systems in which one or more ring members are an independently selected heteroatom. In some embodiments, the “heterocycle”, “heterocyclyl”, or “heterocyclic” group has three to fourteen ring members in which one or more ring members is a heteroatom independently selected from oxygen, sulfur, nitrogen, or phosphorus, and each ring in the system contains 3 to 7 ring members.

Examples of heterocycles include, but are not limited to, 3-1H-benzimidazol-2-one, 3-(1-alkyl)-benzimidazol-2-one, 2-tetrahydrofuranyl, 3-tetrahydrofuranyl, 2-tetrahydrothiophenyl, 3-tetrahydrothiophenyl, 2-morpholino, 3-morpholino, 4-morpholino, 2-thiomorpholino, 3-thiomorpholino, 4-thiomorpholino, 1-pyrrolidinyl, 2-pyrrolidinyl, 3-pyrrolidinyl, 1-tetrahydropiperazinyl, 2-tetrahydropiperazinyl, 3-tetrahydropiperazinyl, 1-piperidinyl, 2-piperidinyl, 3-piperidinyl, 1-pyrazolinyl, 3-pyrazolinyl, 4-pyrazolinyl, 5-pyrazolinyl, 1-piperidinyl, 2-piperidinyl, 3-piperidinyl, 4-piperidinyl, 2-thiazolidinyl, 3-thiazolidinyl, 4-thiazolidinyl, 1-imidazolidinyl, 2-imidazolidinyl, 4-imidazolidinyl, 5-imidazolidinyl, indolinyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, benzothiolane, benzodithiane, and 1,3-dihydro-imidazol-2-one.

Cyclic groups, (e.g. cycloaliphatic and heterocycles), can be linearly fused, bridged, or spirocyclic.

The term “heteroatom” means one or more of oxygen, sulfur, nitrogen, phosphorus, or silicon (including, any oxidized form of nitrogen, sulfur, phosphorus, or silicon; the quaternized form of any basic nitrogen or; a substitutable nitrogen of a heterocyclic ring, for example N (as in 3,4-dihydro-2H-pyrrolyl), NH (as in pyrrolidinyl) or NR⁺ (as in N-substituted pyrrolidinyl)).

The term “unsaturated”, as used herein, means that a moiety has one or more units of unsaturation. As would be known by one of skill in the art, unsaturated groups can be partially unsaturated or fully unsaturated. Examples of partially unsaturated groups include, but are not limited to, butene, cyclohexene, and tetrahydropyridine. Fully unsaturated groups can be aromatic, anti-aromatic, or non-aromatic. Examples of fully unsaturated groups include, but are not limited to, phenyl, cyclooctatetraene, pyridyl, thienyl, and 1-methylpyridin-2(1H)-one.

The term “alkoxy”, or “thioalkyl”, as used herein, refers to an alkyl group, as previously defined, attached through an oxygen (“alkoxy”) or sulfur (“thioalkyl”) atom.

The terms “haloalkyl”, “haloalkenyl”, “haloaliphatic”, and “haloalkoxy” mean alkyl, alkenyl or alkoxy, as the case may be, substituted with one or more halogen atoms. This term includes perfluorinated alkyl groups, such as —CF₃ and —CF₂CF₃.

The terms “halogen”, “halo”, and “hal” mean F, Cl, Br, or I.

The term “aryl” used alone or as part of a larger moiety as in “aralkyl”, “aralkoxy”, or “aryloxyalkyl”, refers to monocyclic, bicyclic, and tricyclic ring systems having a total of five to fourteen ring members, wherein at least one ring in the system is aromatic and wherein each ring in the system contains 3 to 7 ring members. The term “aryl” may be used interchangeably with the term “aryl ring”.

The term “heteroaryl”, used alone or as part of a larger moiety as in “heteroaralkyl” or “heteroarylalkoxy”, refers to monocyclic, bicyclic, and tricyclic ring systems having a total of five to fourteen ring members, wherein at least one ring in the system is aromatic, at least one ring in the system contains one or more heteroatoms, and wherein each ring in the system contains 3 to 7 ring members. The term “heteroaryl” may be used interchangeably with the term “heteroaryl ring” or the term “heteroaromatic”. Examples of heteroaryl rings include, but are not limited to, 2-furanyl, 3-furanyl, N-imidazolyl, 2-imidazolyl, 4-imidazolyl, 5-imidazolyl, benzimidazolyl, 3-isoxazolyl, 4-isoxazolyl, 5-isoxazolyl, 2-oxazolyl, 4-oxazolyl, 5-oxazolyl, N-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 2-pyrimidinyl, 4-pyrimidinyl, 5-pyrimidinyl, pyridazinyl (e.g., 3-pyridazinyl), 2-thiazolyl, 4-thiazolyl, 5-thiazolyl, tetrazolyl (e.g., 5-tetrazolyl), triazolyl (e.g., 2-triazolyl and 5-triazolyl), 2-thienyl, 3-thienyl, benzofuryl, benzothiophenyl, indolyl (e.g., 2-indolyl), pyrazolyl (e.g., 2-pyrazolyl), isothiazolyl, 1,2,3-oxadiazolyl, 1,2,5-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,3-triazolyl, 1,2,3-thiadiazolyl, 1,3,4-thiadiazolyl, 1,2,5-thiadiazolyl, purinyl, pyrazinyl, 1,3,5-triazinyl, quinolinyl (e.g., 2-quinolinyl, 3-quinolinyl, 4-quinolinyl), and isoquinolinyl (e.g., 1-isoquinolinyl, 3-isoquinolinyl, or 4-isoquinolinyl).

It shall be understood that the term “heteroaryl” includes certain types of heteroaryl rings that exist in equilibrium between two different forms. More specifically, for example, species such hydropyridine and pyridinone (and likewise hydroxypyrimidine and pyrimidinone) are meant to be encompassed within the definition of “heteroaryl.”

The term “protecting group” and “protective group” as used herein, are interchangeable and refer to an agent used to temporarily block one or more desired functional groups in a compound with multiple reactive sites. In certain embodiments, a protecting group has one or more, or preferably all, of the following characteristics: a) is added selectively to a functional group in good yield to give a protected substrate that is b) stable to reactions occurring at one or more of the other reactive sites; and c) is selectively removable in good yield by reagents that do not attack the regenerated, deprotected functional group. As would be understood by one skilled in the art, in some cases, the reagents do not attack other reactive groups in the compound. In other cases, the reagents may also react with other reactive groups in the compound. Examples of protecting groups are detailed in Greene, T. W., Wuts, P. G in “Protective Groups in Organic Synthesis”, Third Edition, John Wiley & Sons, New York: 1999 (and other editions of the book), the entire contents of which are hereby incorporated by reference. The term “nitrogen protecting group”, as used herein, refers to an agent used to temporarily block one or more desired nitrogen reactive sites in a multifunctional compound. Preferred nitrogen protecting groups also possess the characteristics exemplified for a protecting group above, and certain exemplary nitrogen protecting groups are also detailed in Chapter 7 in Greene, T. W., Wuts, P. G in “Protective Groups in Organic Synthesis”, Third Edition, John Wiley & Sons, New York: 1999, the entire contents of which are hereby incorporated by reference.

In some embodiments, a methylene unit of an alkyl or aliphatic chain is optionally replaced with another atom or group. Examples of such atoms or groups include, but are not limited to, nitrogen, oxygen, sulfur, —C(O)—, —C(═N—CN)—, —C(═NR)—, —C(═NOR)—, —SO—, and —SO₂—. These atoms or groups can be combined to form larger groups. Examples of such larger groups include, but are not limited to, —OC(O)—, —C(O)CO—, —CO₂—, —C(O)NR—, —C(═N—CN), —NRCO—, —NRC(O)O—, —SO₂NR—, —NRSO₂—, —NRC(O)NR—, —OC(O)NR—, and —NRSO₂NR—, wherein R is, for example, H or C₁₋₆aliphatic. It should be understood that these groups can be bonded to the methylene units of the aliphatic chain via single, double, or triple bonds. An example of an optional replacement (nitrogen atom in this case) that is bonded to the aliphatic chain via a double bond would be —CH₂CH═N—CH₃. In some cases, especially on the terminal end, an optional replacement can be bonded to the aliphatic group via a triple bond. One example of this would be CH₂CH₂CH₂C≡N. It should be understood that in this situation, the terminal nitrogen is not bonded to another atom.

It should also be understood that, the term “methylene unit” can also refer to branched or substituted methylene units. For example, in an isopropyl moiety [—CH(CH₃)₂], a nitrogen atom (e.g. NR) replacing the first recited “methylene unit” would result in dimethylamine [—N(CH₃)₂]. In instances such as these, one of skill in the art would understand that the nitrogen atom will not have any additional atoms bonded to it, and the “R” from “NR” would be absent in this case.

Unless otherwise indicated, the optional replacements form a chemically stable compound. Optional replacements can occur both within the chain and/or at either end of the chain; i.e. both at the point of attachment and/or also at the terminal end. Two optional replacements can also be adjacent to each other within a chain so long as it results in a chemically stable compound. For example, a C₃ aliphatic can be optionally replaced by 2 nitrogen atoms to form —C—N≡N. The optional replacements can also completely replace all of the carbon atoms in a chain. For example, a C₃ aliphatic can be optionally replaced by —NR—, —C(O)—, and —NR— to form —NRC(O)NR— (a urea).

Unless otherwise indicated, if the replacement occurs at the terminal end, the replacement atom is bound to a hydrogen atom on the terminal end. For example, if a methylene unit of —CH₂CH₂CH₃ were optionally replaced with —O—, the resulting compound could be —OCH₂CH₃, —CH₂OCH₃, or —CH₂CH₂OH. It should be understood that if the terminal atom does not contain any free valence electrons, then a hydrogen atom is not required at the terminal end (e.g., —CH₂CH₂CH═O or —CH₂CH₂C≡N).

Unless otherwise indicated, structures depicted herein are also meant to include all isomeric (e.g., enantiomeric, diastereomeric, geometric, conformational, and rotational) forms of the structure. For example, the R and S configurations for each asymmetric center, (Z) and (E) double bond isomers, and (Z) and (E) conformational isomers are included in this invention. As would be understood to one skilled in the art, a substituent can freely rotate around any rotatable bonds. For example, a substituent drawn as

also represents

Therefore, single stereochemical isomers as well as enantiomeric, diastereomeric, geometric, conformational, and rotational mixtures of the present compounds are within the scope of the invention.

Unless otherwise indicated, all tautomeric forms of the compounds of the invention are within the scope of the invention.

Additionally, unless otherwise indicated, structures depicted herein are also meant to include compounds that differ only in the presence of one or more isotopically enriched atoms. For example, compounds having the present structures except for the replacement of hydrogen by deuterium or tritium, or the replacement of a carbon by a ¹³C- or ¹⁴C-enriched carbon are within the scope of this invention. Such compounds are useful, for example, as analytical tools or probes in biological assays.

Pharmaceutically Acceptable Salts

The compounds of this invention can exist in free form for treatment, or where appropriate, as a pharmaceutically acceptable salt.

A “pharmaceutically acceptable salt” means any non-toxic salt of a compound of this invention that, upon administration to a recipient, is capable of providing, either directly or indirectly, a compound of this invention or an inhibitorily active metabolite or residue thereof. As used herein, the term “inhibitorily active metabolite or residue thereof” means that a metabolite or residue thereof is also an inhibitor of the ATR protein kinase.

Pharmaceutically acceptable salts are well known in the art. For example, S. M. Berge et al., describe pharmaceutically acceptable salts in detail in J. Pharmaceutical Sciences, 1977, 66, 1-19, incorporated herein by reference. Pharmaceutically acceptable salts of the compounds of this invention include those derived from suitable inorganic and organic acids and bases. These salts can be prepared in situ during the final isolation and purification of the compounds. Acid addition salts can be prepared by 1) reacting the purified compound in its free-based form with a suitable organic or inorganic acid and 2) isolating the salt thus formed.

Examples of pharmaceutically acceptable, nontoxic acid addition salts are salts of an amino group formed with inorganic acids such as hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid and perchloric acid or with organic acids such as acetic acid, oxalic acid, maleic acid, tartaric acid, citric acid, succinic acid or malonic acid or by using other methods used in the art such as ion exchange. Other pharmaceutically acceptable salts include adipate, alginate, ascorbate, aspartate, benzenesulfonate, benzoate, bisulfate, borate, butyrate, camphorate, camphorsulfonate, citrate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptonate, glycerophosphate, glycolate, gluconate, glycolate, hemisulfate, heptanoate, hexanoate, hydrochloride, hydrobromide, hydroiodide, 2-hydroxy-ethanesulfonate, lactobionate, lactate, laurate, lauryl sulfate, malate, maleate, malonate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, nitrate, oleate, oxalate, palmitate, palmoate, pectinate, persulfate, 3-phenylpropionate, phosphate, picrate, pivalate, propionate, salicylate, stearate, succinate, sulfate, tartrate, thiocyanate, p-toluenesulfonate, undecanoate, valerate salts, and the like.

Base addition salts can be prepared by 1) reacting the purified compound in its acid form with a suitable organic or inorganic base and 2) isolating the salt thus formed. Salts derived from appropriate bases include alkali metal (e.g., sodium, lithium, and potassium), alkaline earth metal (e.g., magnesium and calcium), ammonium and N+(C₁₋₄ alkyl)₄ salts. This invention also envisions the quaternization of any basic nitrogen-containing groups of the compounds disclosed herein. Water or oil-soluble or dispersible products may be obtained by such quaternization.

Further pharmaceutically acceptable salts include, when appropriate, nontoxic ammonium, quaternary ammonium, and amine cations formed using counterions such as halide, hydroxide, carboxylate, sulfate, phosphate, nitrate, loweralkyl sulfonate and aryl sulfonate. Other acids and bases, while not in themselves pharmaceutically acceptable, may be employed in the preparation of salts useful as intermediates in obtaining the compounds of the invention and their pharmaceutically acceptable acid or base addition salts.

Abbreviations

The following abbreviations are used:

-   DMSO dimethyl sulfoxide -   ATP adenosine triphosphate -   ¹HNMR proton nuclear magnetic resonance -   HPLC high performance liquid chromatography -   LCMS liquid chromatography-mass spectrometry -   TLC thin layer chromatography -   Rt retention time     Compound Uses

One aspect of this invention provides a compound for use in inhibiting ATR kinase. These compounds have formula I:

-   -   or an acceptable salt thereof;     -   wherein

-   R¹ is a 5-6 membered monocyclic aryl or heteroaryl ring having 0-4     heteroatoms independently selected from nitrogen, oxygen, or sulfur,     wherein said monocyclic aryl or heteroaryl ring is optionally fused     to another ring to form an 8-10 membered bicyclic aryl or heteroaryl     ring having 0-6 heteroatoms independently selected from nitrogen,     oxygen, or sulfur; each R¹ is optionally substituted with 1-5 J¹     groups;

-   R² is a 5-6 membered monocyclic aryl or heteroaryl ring having 0-3     heteroatoms independently selected from nitrogen, oxygen, or sulfur,     wherein said monocyclic aryl or heteroaryl ring is optionally fused     to another ring to form an 8-10 membered bicyclic aryl or heteroaryl     ring having 0-4 heteroatoms independently selected from nitrogen,     oxygen, or sulfur; each R² is optionally substituted with 1-5 J²     groups;

-   L is —C(O)NH— or —C(O)N(C₁₋₆alkyl)-;

-   n is 0 or 1;

-   Each J¹ and J² is independently halo, —CN, —NO₂, —V¹—R, or     —(V²)_(m)-Q;

-   V¹ is a C₁₋₁₀aliphatic chain wherein 0-3 methylene units are     optionally and independently replaced with O, NR″, S, C(O), S(O), or     S(O)₂; V¹ is optionally substituted with 1-6 occurrences of J^(V1);

-   V² is a C₁₋₁₀aliphatic chain wherein 0-3 methylene units are     optionally and independently replaced with O, NR″, S, C(O), S(O), or     S(O)₂; V² is optionally substituted with 1-6 occurrences of J^(V2);

-   m is 0 or 1;

-   Q is a 3-8 membered saturated or unsaturated monocyclic ring having     0-4 heteroatoms independently selected from nitrogen, oxygen, or     sulfur, or a 9-10 membered saturated or unsaturated bicyclic ring     having 0-6 heteroatoms independently selected from nitrogen, oxygen,     or sulfur; each Q is optionally substituted with 0-5 J^(Q);

-   each J^(V1) or J^(V2) is independently halogen, CN, NH₂, NO₂,     C₁₋₄aliphatic, NH(C₁₋₄aliphatic), N(C₁₋₄aliphatic)₂, OH,     O(C₁₋₄aliphatic), CO₂H, CO₂(C₁₋₄aliphatic), C(O)NH₂,     C(O)NH(C₁₋₄aliphatic), C(O)N(C₁₋₄aliphatic)₂, NHCO(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)CO(C₁₋₄aliphatic), SO₂(C₁₋₄aliphatic),     NHSO₂(C₁₋₄aliphatic), or N(C₁₋₄aliphatic)SO₂(C₁₋₄aliphatic), wherein     said C₁₋₄aliphatic is optionally substituted with halo;

-   R is H or C₁₋₆aliphatic wherein said C₁₋₆aliphatic is optionally     substituted with 1-4 occurrences of NH₂, NH(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic),     NO₂, CN, CO₂H, CO₂(C₁₋₄aliphatic), CO(C₁₋₄aliphatic),     O(haloC₁₋₄aliphatic), or haloC₁₋₄aliphatic;

-   each J^(Q) is independently halo, oxo, CN, NO₂, X—R, or —(X)_(p)-Q⁴;

-   p is 0 or 1;

-   X is C₁₋₁₀aliphatic; wherein 1-3 methylene units of said     C₁₋₆aliphatic are optionally replaced with —NR, —O—, —S—, C(O),     S(O)₂, or S(O); wherein X is optionally and independently     substituted with 1-4 occurrences of NH₂, NH(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic),     NO₂, CN, CO(C₁₋₄aliphatic), CO₂H, CO₂(C₁₋₄aliphatic), C(O)NH₂,     C(O)NH(C₁₋₄aliphatic), C(O)N(C₁₋₄aliphatic)₂, SO(C₁₋₄aliphatic),     SO₂(C₁₋₄aliphatic), SO₂NH(C₁₋₄aliphatic), SO₂N(C₁₋₄aliphatic)₂,     NHC(O)(C₁₋₄aliphatic), N(C₁₋₄aliphatic)C(O)(C₁₋₄aliphatic), wherein     said C₁₋₄aliphatic is optionally substituted with 1-3 occurrences of     halo;

-   Q⁴ is a 3-8 membered saturated or unsaturated monocyclic ring having     0-4 heteroatoms independently selected from nitrogen, oxygen, or     sulfur, or a 8-10 membered saturated or unsaturated bicyclic ring     having 0-6 heteroatoms independently selected from nitrogen, oxygen,     or sulfur; each Q⁴ is optionally substituted with 1-5 J^(Q4);

-   J^(Q4) is halo, CN, or C₁₋₄alkyl wherein up to 2 methylene units are     optionally replaced with O, NR*, S, C(O), S(O), or S(O)₂;

-   R is H or C₁₋₄alkyl wherein said C₁₋₄alkyl is optionally substituted     with 1-4 halo;

-   R′, R″, and R* are each independently H, C₁₋₄alkyl, or is absent;     wherein said C₁₋₄alkyl is optionally substituted with 1-4 halo.

In one embodiment, R¹ is a 5-6 membered monocyclic aryl or heteroaryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said monocyclic aryl or heteroaryl ring is optionally fused to another ring to form an 8-10 membered bicyclic aryl or heteroaryl ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur; each R¹ is optionally substituted with 1-5 J¹ groups;

-   R² is a 5-6 membered monocyclic aryl or heteroaryl ring having 0-3     heteroatoms independently selected from nitrogen, oxygen, or sulfur,     wherein said monocyclic aryl or heteroaryl ring is optionally fused     to another ring to form an 8-10 membered bicyclic aryl or heteroaryl     ring having 0-4 heteroatoms independently selected from nitrogen,     oxygen, or sulfur; each R² is optionally substituted with 1-5 J²     groups; -   each J^(V1) or J^(V2) is independently NH₂, NH(C₁₋₄aliphatic),     N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH, O(C₁₋₄aliphatic),     NO₂, CN, CO₂H, CO₂(C₁₋₄aliphatic), CO(C₁₋₄aliphatic),     O(haloC₁₋₄aliphatic), or haloC₁₋₄aliphatic; -   each J^(Q) is independently halogen, NO₂, CN, or C₁₋₆aliphatic     wherein up to 1 methylene unit is optionally replaced with NR′, O,     S, CO, CO₂, CONR′, SO, SO₂, SO₂NR′, OCO, NR′CO, NR′COO, NR′SO,     NR′SO₂, NR′SO₂NR′, OCONR′, or NR′CONR′; wherein said C₁₋₆aliphatic     is optionally substituted with 1-4 substituents selected from NH₂,     NH(C₁₋₄aliphatic), N(C₁₋₄aliphatic)₂, halogen, C₁₋₄aliphatic, OH,     O(C₁₋₄aliphatic), NO₂, CN, CO₂H, CO₂ (C₁₋₄aliphatic),     CO(C₁₋₄aliphatic), O(haloC₁₋₄aliphatic), or haloC₁₋₄aliphatic.

In some embodiments, R² is substituted with one or two occurrences of J². In other embodiments,

In some embodiments, R² is a 5-6 membered monocyclic aromatic ring. In some embodiments, R² is a 6-membered aromatic ring. In other embodiments, R² is phenyl or pyridyl. In yet other embodiments, R² is phenyl.

R² is optionally substituted with 1-5 J² groups. In some embodiments, 1-3 J² groups, and in other embodiments, 1-2 J² groups. In yet another embodiment, R² is substituted with 0 or 1 occurrences of J². In some embodiments, J² is —(V²)_(m)-Q or V¹—R; wherein

-   -   each V¹ and V² is independently a C₁₋₆aliphatic chain wherein         0-3 methylene units are optionally replaced with O, NR′, S,         C(O), S(O), or S(O)₂; wherein the first or second methylene         group away from the point of attachment is replaced with C(O),         S(O), or S(O)₂, S or O;     -   m is 1;     -   R is H; and     -   Q is a 5-7 membered monocyclic ring containing 0-2 heteroatoms         selected from oxygen, nitrogen, or sulfur; wherein said Q is         optionally substituted with 1-3 occurrences of halogen,         C₁₋₃alkyl, CN, OH, O(C₁₋₃alkyl), NH₂, NH(C₁₋₃alkyl),         N(C₁₋₃alkyl)₂, or CO(C₁₋₃alkyl).

In some embodiments, Q is a 5-6 membered monocyclic ring.

Another to another embodiment, n is 0.

In some embodiments, n is 0 and R¹ is a 5-6 membered monocyclic aromatic ring having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or a 9-10 membered bicyclic aromatic ring having 1-6 heteroatoms independently selected from nitrogen, oxygen, or sulfur; wherein each R¹ is optionally substituted with 1-5 J¹ groups.

In some embodiments, R¹ is benzothiazole, oxadiazole, benzoxazole, triazole, thiadiazole, or isoxazole. In other embodiments, R¹ is benzimidazole, benzothioazole, oxadiazole, isoxazole, or triazole. In some embodiments, R¹ is benzimidazole. In other embodiments, R¹ is isoxazole.

R¹ is optionally substituted with 1-5 J¹ groups. In some embodiments, 1-3 J¹ groups, and in other embodiments, 1-2 J¹ groups. In some embodiments, J¹ is halo, CN, NO₂, or —V¹—R. In other embodiments, J¹ is halo, CN, C₁₋₆alkyl, OR, SR, NR″R, C(O)R, C(O)OR, C(O)NR″R, S(O)₂R, or S(O)R. In yet other embodiments, J¹ is phenyl optionally substituted with NH₂, C₁₋₄alkyl, thiophene, or CH₂NH₂.

In some embodiments, R² is a 5-6 membered monocyclic aromatic ring. In some embodiments, R² is a 6-membered aromatic ring. In other embodiments, R² is phenyl or pyridyl. In yet other embodiments, R² is phenyl.

In another embodiment, J² is —V¹—R or —(V²)_(m)-Q; wherein V¹ and V² are O, NR″, —CO—, or —SO₂—; Q is a 5-6 membered heterocyclic ring containing 1-2 heteroatoms selected from N or 0; and J^(V1) and J^(V2) are halo. In another embodiment, J² is SO₂CH₃, morpholinyl, CH₂OH, C(O)-(morpholinyl), C(O)NH(C₁₋₄alkyl)OH, piperazinyl, CN, CH₂NHC(O)CH₃, halo, C(O)NH(C₁₋₄alkyl)pyrrolidinyl, or SO₂(pyrrolidinyl).

In some embodiments, R² is phenyl or pyridyl.

In some embodiments, J² is SO₂(C₁₋₄alkyl).

In one embodiment,

-   -   n is 0;     -   R¹ is benzimidazole, benzothiazole, benzoxazole, oxadiazole,         isoxazole, thiadiazole, or triazole;     -   J¹ is halo, CN, NO₂, or —V¹—R;     -   R² is phenyl or pyridyl;     -   J² is —(V²)_(m)-Q or —V¹—R;     -   m is 1;     -   V¹ and V² are —SO₂—, —O—, —NR—, or —CO—;     -   Q is a 5-6 membered heterocyclic ring containing 1-2 heteroatoms         selected from nitrogen or oxygen; and     -   R is H or C₁₋₆alkyl wherein said C₁₋₆alkyl is optionally         substituted with 1-4 halo.

According to another embodiment, n is 1.

In some embodiments, R¹ is phenyl, pyridyl, pyrimidyl, pyrazinyl, piperonyl, indolyl, benzimidazolyl, indazolyl, benzothiazolyl, benzothiophenyl (i.e. benzothienyl), benzoxazolyl, pyrrolopyrimidinyl, pyrrolopyridinyl, azaindazolyl, or azaindolyl. In other embodiments, R¹ is phenyl, pyridyl, pyrimidyl, piperonyl, or indole. In yet other embodiments, R¹ is phenyl.

R¹ is optionally substituted with 1-5 J¹ groups. In some embodiments, 1-3 J¹ groups, and in other embodiments, 1-2 J¹ groups. In some embodiments, J¹ is C₁₋₆alkyl, CN, halo, OR, NR″R, SR, COR, CO₂R, CONR″R, SOR, SO₂R, S(O)₂NR″R, OCOR, NRC(O)R, NRCOOR, NRSOR, NRSO₂R, NRSO₂NR″R, OCONR″R, or NRCONR″R; 4-6 membered fully saturated monocyclic ring containing 0-2 heteroatoms selected from oxygen, nitrogen, or sulfur. In other embodiments, J¹ is C₁₋₆alkyl, CN, halo, OR, NR″R, CONR″R, S(O)₂NR″R, NC(O)R, or pyrrolidinyl.

In some embodiments, R² is phenyl, pyridyl, pyrimidyl, indole, furanyl, pyrazole, thiophene, tetrahydropyran, or indazole. R² is optionally substituted with 1-5 J² groups. In some embodiments, 1-3 J² groups, and in other embodiments, 1-2 J² groups. In some embodiments, J² is halo, CN, NR″R, C₁₋₆alkyl, OR, SO₂R, NHSO₂R, COOR, CONR″R, morpholinyl, —V¹—R, or —(V²)_(m)-Q, wherein

-   -   V¹ and V² are CO, —CONR″—, —CONR″—(C₁₋₄alkyl)-,         —CONR″—(C₁₋₄alkyl)-OCH₂—, —CONR″—(C₁₋₄alkyl)-N(CH₃)—,     -   R is H or C₁₋₄alkyl; and     -   Q is 1,4-diazepanyl, azetidinyl optionally substituted with OMe,         piperidinyl optionally substituted with C₁₋₄alkyl, 4-CH₂OH,         CONH₂, pyrrolidinyl, OH, or CH₂-pyrrolidinyl; piperazinyl         optionally substituted with CH₂CH₂CN, CH₃, COCH₃, pyrrolidinyl         optionally substituted with dimethylamino, tetrahydropyran,         C₃₋₁₀cycloalkyl optionally substituted with OH.

In other embodiments, J² is SO₂CH₃, NHSO₂CH₃, CN, OH, OCH₃, F, N(CH₃)₂, NHSO₂CH₃, CF₃, C₁₋₆alkyl, CO(1,4-diazepanyl), COOH, CONH₂, CON(CH₃)₂, CO(azetidinyl), CON(CH₃)(C₁₋₄alkyl)OCH₃, CONH(C₁₋₄alkyl)piperazinyl, CONH(C₁₋₄alkyl)piperidinyl, CONH-tetrahydropyran, CON(methylpiperidinyl), CO(piperidinyl), CONH-cyclopropyl, CO(morpholinyl), CON(CH₃)—(C₁₋₄alkyl)-N(CH₃)₂, CO(piperazinyl), CONH—(C₁₋₄alkyl)-pyrrolidinyl, CONH—(C₁₋₄alkyl)-piperidinyl, CONH—(C₁₋₄alkyl)-tetrahydropyranyl, morpholinyl, CO(pyrrolidinyl), CO(piperidinyl), CO(pyrrolidinyl), CH₂-pyrrolidinyl, or CONH(cyclohexyl), wherein said J² is optionally substituted with C₁₋₄alkyl, CONH₂, pyrrolidinyl, OH, O(C₁₋₄alkyl), NH₂, NH(C₁₋₄alkyl), N(C₁₋₄alkyl)₂, —(C₁₋₄alkyl)-CN, —(C₁₋₄alkyl)-OH, —(C₁₋₄alkyl)-N(C₁₋₄alkyl)₂, or CO(C₁₋₄alkyl).

In some embodiments,

-   -   n is 1;     -   R¹ is phenyl;     -   R² is phenyl, pyridyl, indole, furanyl, pyrazole, thiophene,         tetrahydropyran, or indazole;     -   J² is halo, CN, NR″R, C₁₋₆alkyl, OR, SO₂R, NHSO₂R, COOR, CONR″R,         morpholinyl, —V¹—R, or —(V²)_(m)-Q, wherein     -   m is 1;     -   V¹ and V² are CO, —CONR—, —CONR—(C₁₋₄alkyl)-,         —CONR—(C₁₋₄alkyl)-OCH₂—, or —CONR—(C₁₋₄alkyl)-N(CH₃)—;     -   R is H or C₁₋₄alkyl; and     -   Q is 1,4-diazepanyl, azetidinyl optionally substituted with OMe,         piperidinyl optionally substituted with C₁₋₄alkyl, 4-CH₂OH,         CONH₂, pyrrolidinyl, OH, or CH₂-pyrrolidinyl; piperazinyl         optionally substituted with CH₂CH₂CN, CH₃, COCH₃, pyrrolidinyl         optionally substituted with dimethylamino, tetrahydropyran,         C₃₋₁₀cycloalkyl optionally substituted with OH; and     -   J¹ is C₁₋₆alkyl, CN, halo, OR, NR″R, SR, COR, CO₂R, CO NR″R,         SOR, SO₂R, S(O)₂NR″R, OCOR, NRC(O)R, NRCOOR, NRSOR, NRSO₂R,         NRSO₂NR″R, OCONR″R, or NRCONR″R; 4-6 membered fully saturated         monocyclic ring containing 0-2 heteroatoms selected from oxygen,         nitrogen, or sulfur.

In other embodiments,

-   -   n is 0;     -   R¹ is benzimidazole, benzothioazole, oxadiazole, isoxazole, or         triazole;     -   J¹ is halo, CN, NO₂, or —V¹—R;     -   R² is phenyl or pyridyl;     -   J² is —(V²)_(m)-Q or -V1-R;     -   m is 1;     -   V¹ and V² are —SO₂—, —O—, —NR″—, or —CO—;     -   Q is a 5-6 membered heterocyclic ring containing 1-2 heteroatoms         selected from nitrogen or oxygen; and     -   R is H or C₁₋₆alkyl wherein said C₁₋₆alkyl is optionally         substituted with 1-4 halo.

In yet other embodiments, the compound is selected from Table 1 (above).

One aspect of this invention provides compounds that are inhibitors of ATR kinase, and thus are useful for treating or lessening the severity of a disease, condition, or disorder where ATR is implicated in the disease, condition, or disorder.

Another aspect of this invention provides compounds that are useful for the treatment of diseases, disorders, and conditions characterized by excessive or abnormal cell proliferation. Such diseases include, a proliferative or hyperproliferative disease. Examples of proliferative and hyperproliferative diseases include, without limitation, cancer and myeloproliferative disorders.

In some embodiments, said compounds are selected from the group consisting of a compound of formula I, II, III, IV, IA, IIA, IIIA, IVA, IA-i, IA-ii, IA-iii, V, VI, and VII.

The term “cancer” includes, but is not limited to the following cancers. Oral: buccal cavity, lip, tongue, mouth, pharynx; Cardiac: sarcoma (angiosarcoma, fibrosarcoma, rhabdomyosarcoma, liposarcoma), myxoma, rhabdomyoma, fibroma, lipoma and teratoma; Lung: bronchogenic carcinoma (squamous cell or epidermoid, undifferentiated small cell, undifferentiated large cell, adenocarcinoma), alveolar (bronchiolar) carcinoma, bronchial adenoma, sarcoma, lymphoma, chondromatous hamartoma, mesothelioma; Gastrointestinal: esophagus (squamous cell carcinoma, larynx, adenocarcinoma, leiomyosarcoma, lymphoma), stomach (carcinoma, lymphoma, leiomyosarcoma), pancreas (ductal adenocarcinoma, insulinoma, glucagonoma, gastrinoma, carcinoid tumors, vipoma), small bowel or small intestines (adenocarcinoma, lymphoma, carcinoid tumors, Karposi's sarcoma, leiomyoma, hemangioma, lipoma, neurofibroma, fibroma), large bowel or large intestines (adenocarcinoma, tubular adenoma, villous adenoma, hamartoma, leiomyoma), colon, colon-rectum, colorectal; rectum; Genitourinary tract: kidney (adenocarcinoma, Wilm's tumor [nephroblastoma], lymphoma, leukemia), bladder and urethra (squamous cell carcinoma, transitional cell carcinoma, adenocarcinoma), prostate (adenocarcinoma, sarcoma), testis (seminoma, teratoma, embryonal carcinoma, teratocarcinoma, choriocarcinoma, sarcoma, interstitial cell carcinoma, fibroma, fibroadenoma, adenomatoid tumors, lipoma); Liver: hepatoma (hepatocellular carcinoma), cholangiocarcinoma, hepatoblastoma, angiosarcoma, hepatocellular adenoma, hemangioma, biliary passages; Bone: osteogenic sarcoma (osteosarcoma), fibrosarcoma, malignant fibrous histiocytoma, chondrosarcoma, Ewing's sarcoma, malignant lymphoma (reticulum cell sarcoma), multiple myeloma, malignant giant cell tumor chordoma, osteochronfroma (osteocartilaginous exostoses), benign chondroma, chondroblastoma, chondromyxofibroma, osteoid osteoma and giant cell tumors; Nervous system: skull (osteoma, hemangioma, granuloma, xanthoma, osteitis deformans), meninges (meningioma, meningiosarcoma, gliomatosis), brain (astrocytoma, medulloblastoma, glioma, ependymoma, germinoma [pinealoma], glioblastoma multiform, oligodendroglioma, schwannoma, retinoblastoma, congenital tumors), spinal cord neurofibroma, meningioma, glioma, sarcoma); Gynecological: uterus (endometrial carcinoma), cervix (cervical carcinoma, pre-tumor cervical dysplasia), ovaries (ovarian carcinoma [serous cystadenocarcinoma, mucinous cystadenocarcinoma, unclassified carcinoma], granulosa-thecal cell tumors, Sertoli-Leydig cell tumors, dysgerminoma, malignant teratoma), vulva (squamous cell carcinoma, intraepithelial carcinoma, adenocarcinoma, fibrosarcoma, melanoma), vagina (clear cell carcinoma, squamous cell carcinoma, botryoid sarcoma (embryonal rhabdomyosarcoma), fallopian tubes (carcinoma), breast; Hematologic: blood (myeloid leukemia [acute and chronic], acute lymphoblastic leukemia, chronic lymphocytic leukemia, myeloproliferative diseases, multiple myeloma, myelodysplastic syndrome), Hodgkin's disease, non-Hodgkin's lymphoma [malignant lymphoma] hairy cell; lymphoid disorders; Skin: malignant melanoma, basal cell carcinoma, squamous cell carcinoma, Karposi's sarcoma, keratoacanthoma, moles dysplastic nevi, lipoma, angioma, dermatofibroma, keloids, psoriasis, Thyroid gland: papillary thyroid carcinoma, follicular thyroid carcinoma; medullary thyroid carcinoma, multiple endocrine neoplasia type 2A, multiple endocrine neoplasia type 2B, familial medullary thyroid cancer, pheochromocytoma, paraganglioma; and Adrenal glands: neuroblastoma.

Thus, the term “cancerous cell” as provided herein, includes a cell afflicted by any one of the above-identified conditions. In some embodiments, the cancer is selected from colorectal, thyroid, or breast cancer.

The term “myeloproliferative disorders”, includes disorders such as polycythemia vera, thrombocythemia, myeloid metaplasia with myelofibrosis, hypereosinophilic syndrome, juvenile myelomonocytic leukemia, systemic mast cell disease, and hematopoietic disorders, in particular, acute-myelogenous leukemia (AML), chronic-myelogenous leukemia (CML), acute-promyelocytic leukemia (APL), and acute lymphocytic leukemia (ALL).

Pharmaceutically Acceptable Derivatives or Prodrugs

In addition to the compounds of this invention, pharmaceutically acceptable derivatives or prodrugs of the compounds of this invention may also be employed in compositions to treat or prevent the herein identified disorders.

The compounds of this invention can also exist as pharmaceutically acceptable derivatives.

A “pharmaceutically acceptable derivative” is an adduct or derivative which, upon administration to a patient in need, is capable of providing, directly or indirectly, a compound as otherwise described herein, or a metabolite or residue thereof. Examples of pharmaceutically acceptable derivatives include, but are not limited to, esters and salts of such esters.

A “pharmaceutically acceptable derivative or prodrug” means any pharmaceutically acceptable ester, salt of an ester or other derivative or salt thereof of a compound, of this invention which, upon administration to a recipient, is capable of providing, either directly or indirectly, a compound of this invention or an inhibitorily active metabolite or residue thereof. Particularly favoured derivatives or prodrugs are those that increase the bioavailability of the compounds of this invention when such compounds are administered to a patient (e.g., by allowing an orally administered compound to be more readily absorbed into the blood) or which enhance delivery of the parent compound to a biological compartment (e.g., the brain or lymphatic system) relative to the parent species.

Pharmaceutically acceptable prodrugs of the compounds of this invention include, without limitation, esters, amino acid esters, phosphate esters, metal salts and sulfonate esters.

Pharmaceutical Compositions

The present invention also provides compounds and compositions that are useful as inhibitors of ATR kinase.

One aspect of this invention provides pharmaceutically acceptable compositions that comprise any of the compounds as described herein, and optionally comprise a pharmaceutically acceptable carrier, adjuvant or vehicle.

The pharmaceutically acceptable carrier, adjuvant, or vehicle, as used herein, includes any and all solvents, diluents, or other liquid vehicle, dispersion or suspension aids, surface active agents, isotonic agents, thickening or emulsifying agents, preservatives, solid binders, lubricants and the like, as suited to the particular dosage form desired. Remington's Pharmaceutical Sciences, Sixteenth Edition, E. W. Martin (Mack Publishing Co., Easton, Pa., 1980) discloses various carriers used in formulating pharmaceutically acceptable compositions and known techniques for the preparation thereof. Except insofar as any conventional carrier medium is incompatible with the compounds of the invention, such as by producing any undesirable biological effect or otherwise interacting in a deleterious manner with any other component(s) of the pharmaceutically acceptable composition, its use is contemplated to be within the scope of this invention.

Some examples of materials which can serve as pharmaceutically acceptable carriers include, but are not limited to, ion exchangers, alumina, aluminum stearate, lecithin, serum proteins, such as human serum albumin, buffer substances such as phosphates, glycine, sorbic acid, or potassium sorbate, partial glyceride mixtures of saturated vegetable fatty acids, water, salts or electrolytes, such as protamine sulfate, disodium hydrogen phosphate, potassium hydrogen phosphate, sodium chloride, zinc salts, colloidal silica, magnesium trisilicate, polyvinyl pyrrolidone, polyacrylates, waxes, polyethylene-polyoxypropylene-block polymers, wool fat, sugars such as lactose, glucose and sucrose; starches such as corn starch and potato starch; cellulose and its derivatives such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; powdered tragacanth; malt; gelatin; talc; excipients such as cocoa butter and suppository waxes; oils such as peanut oil, cottonseed oil; safflower oil; sesame oil; olive oil; corn oil and soybean oil; glycols; such a propylene glycol or polyethylene glycol; esters such as ethyl oleate and ethyl laurate; agar; buffering agents such as magnesium hydroxide and aluminum hydroxide; alginic acid; pyrogen-free water; isotonic saline; Ringer's solution; ethyl alcohol, and phosphate buffer solutions, as well as other non-toxic compatible lubricants such as sodium lauryl sulfate and magnesium stearate, as well as coloring agents, releasing agents, coating agents, sweetening, flavoring and perfuming agents, preservatives and antioxidants can also be present in the composition, according to the judgment of the formulator.

Combination Therapies

Another aspect of this invention is directed towards a method of treating cancer in a subject in need thereof, comprising administration of a compound of this invention or a pharmaceutically acceptable salt thereof, and an additional therapeutic agent. In some embodiments, said method comprises the sequential or co-administration of the compound or a pharmaceutically acceptable salt thereof, and the additional therapeutic agent.

In some embodiments, said additional therapeutic agent is an anti-cancer agent. In other embodiments, said additional therapeutic agent is a DNA-damaging agent. In yet other embodiments, said additional therapeutic agent is selected from radiation therapy, chemotherapy, or other agents typically used in combination with radiation therapy or chemotherapy, such as radiosensitizers and chemosensitizers.

As would be known by one of skill in the art, radiosensitizers are agents that can be used in combination with radiation therapy. Radiosensitizers work in various different ways, including, but not limited to, making cancer cells more sensitive to radiation therapy, working in synergy with radiation therapy to provide an improved synergistic effect, acting additively with radiation therapy, or protecting surrounding healthy cells from damage caused by radiation therapy. Likewise chemosensitizers are agents that can be used in combination with chemotherapy. Similarly, chemosensitizers work in various different ways, including, but not limited to, making cancer cells more sensitive to chemotherapy, working in synergy with chemotherapy to provide an improved synergistic effect, acting additively to chemotherapy, or protecting surrounding healthy cells from damage caused by chemotherapy.

Examples of DNA-damaging agents that may be used in combination with compounds of this invention include, but are not limited to Platinating agents, such as Carboplatin, Nedaplatin, Satraplatin and other derivatives; Topo I inhibitors, such as Topotecan, irinotecan/SN38, rubitecan and other derivatives; Antimetabolites, such as Folic family (Methotrexate, Pemetrexed and relatives); Purine antagonists and Pyrimidine antagonists (Thioguanine, Fludarabine, Cladribine, Cytarabine, Gemcitabine, 6-Mercaptopurine, 5-Fluorouracil (5FU) and relatives); Alkylating agents, such as Nitrogen mustards (Cyclophosphamide, Melphalan, Chlorambucil, mechlorethamine, Ifosfamide and relatives); nitrosoureas (eg Carmustine); Triazenes (Dacarbazine, temozolomide); Alkyl sulphonates (eg Busulfan); Procarbazine and Aziridines; Antibiotics, such as Hydroxyurea, Anthracyclines (doxorubicin, daunorubicin, epirubicin and other derivatives); Anthracenediones (Mitoxantrone and relatives); Streptomyces family (Bleomycin, Mitomycin C, actinomycin); and Ultraviolet light.

Other therapies or anticancer agents that may be used in combination with the inventive agents of the present invention include surgery, radiotherapy (in but a few examples, gamma-radiation, neutron beam radiotherapy, electron beam radiotherapy, proton therapy, brachytherapy, and systemic radioactive isotopes, to name a few), endocrine therapy, biologic response modifiers (interferons, interleukins, and tumor necrosis factor (TNF) to name a few), hyperthermia and cryotherapy, agents to attenuate any adverse effects (e.g., antiemetics), and other approved chemotherapeutic drugs, including, but not limited to, the DNA damaging agents listed herein, spindle poisons (Vinblastine, Vincristine, Vinorelbine, Paclitaxel), podophyllotoxins (Etoposide, Irinotecan, Topotecan), nitrosoureas (Carmustine, Lomustine), inorganic ions (Cisplatin, Carboplatin), enzymes (Asparaginase), and hormones (Tamoxifen, Leuprolide, Flutamide, and Megestrol), Gleevec™, adriamycin, dexamethasone, and cyclophosphamide.

A compound of the instant invention may also be useful for treating cancer in combination with any of the following therapeutic agents: abarelix (Plenaxis Depot®); aldesleukin (Prokine®); Aldesleukin (Proleukin®); Alemtuzumabb (Campath®); alitretinoin (Panretin®); allopurinol (Zyloprim®); altretamine (Hexalen®); amifostine (Ethyol®); anastrozole (Arimidex®); arsenic trioxide (Trisenox®); asparaginase (Elspar®); azacitidine (Vidaza®); bevacuzimab (Avastin®); bexarotene capsules (Targretin®); bexarotene gel (Targretin®); bleomycin (Blenoxane®); bortezomib (Velcade®); busulfan intravenous (Busulfex®); busulfan oral (Myleran®); calusterone (Methosarb®); capecitabine (Xeloda®); carboplatin (Paraplatin®); carmustine (BCNU®, BiCNU®); carmustine (Gliadel®); carmustine with Polifeprosan 20 Implant (Gliadel Wafer®); celecoxib (Celebrex®); cetuximab (Erbitux®); chlorambucil (Leukeran®); cisplatin (Platinol®); cladribine (Leustatin®, 2-CdA®); clofarabine (Clolar®); cyclophosphamide (Cytoxan®, Neosar®); cyclophosphamide (Cytoxan Injection®); cyclophosphamide (Cytoxan Tablet®); cytarabine (Cytosar-U®); cytarabine liposomal (DepoCyt®); dacarbazine (DTIC-Dome®); dactinomycin, actinomycin D (Cosmegen®); Darbepoetin alfa (Aranesp®); daunorubicin liposomal (DanuoXome®); daunorubicin, daunomycin (Daunorubicin®); daunorubicin, daunomycin (Cerubidine®); Denileukin diftitox (Ontak®); dexrazoxane (Zinecard®); docetaxel (Taxotere®); doxorubicin (Adriamycin PFS®); doxorubicin (Adriamycin®, Rubex®); doxorubicin (Adriamycin PFS Injection®); doxorubicin liposomal (Doxil®); dromostanolone propionate (Dromostanolone®); dromostanolone propionate (masterone Injection®); Elliott's B Solution (Elliott's B Solution®); epirubicin (Ellence®); Epoetin alfa (Epogen®); erlotinib (Tarceva®); estramustine (Emcyt®); etoposide phosphate (Etopophos®); etoposide, VP-16 (Vepesid®); exemestane (Aromasin®); Filgrastim (Neupogen®); floxuridine (intraarterial) (FUDR®); fludarabine (Fludara®); fluorouracil, 5-FU (Adrucil®); fulvestrant (Faslodex®); gefitinib (Iressa®); gemcitabine (Gemzar®); gemtuzumab ozogamicin (Mylotarg®); goserelin acetate (Zoladex Implant®); goserelin acetate (Zoladex®); histrelin acetate (Histrelin Implant®); hydroxyurea (Hydrea®); Ibritumomab Tiuxetan (Zevalin®); idarubicin (Idamycin®); ifosfamide (IFEX®); imatinib mesylate (Gleevec®); interferon alfa 2a (Roferon A®); Interferon alfa-2b (Intron A®); irinotecan (Camptosar®); lenalidomide (Revlimid®); letrozole (Femara®); leucovorin (Wellcovorin®, Leucovorin®); Leuprolide Acetate (Eligard®); levamisole (Ergamisol®); lomustine, CCNU (CeeBU®); meclorethamine, nitrogen mustard (Mustargen®); megestrol acetate (Megace®); melphalan, L-PAM (Alkeran®); mercaptopurine, 6-MP (Purinethol®); mesna (Mesnex®); mesna (Mesnex Tabs®); methotrexate (Methotrexate®); methoxsalen (Uvadex®); mitomycin C (Mutamycin®); mitotane (Lysodren®); mitoxantrone (Novantrone®); nandrolone phenpropionate (Durabolin-50®); nelarabine (Arranon®); Nofetumomab (Verluma®); Oprelvekin (Neumega®); oxaliplatin (Eloxatin®); paclitaxel (Paxene®); paclitaxel (Taxol®); paclitaxel protein-bound particles (Abraxane®); palifermin (Kepivance®); pamidronate (Aredia®); pegademase (Adagen (Pegademase Bovine)®); pegaspargase (Oncaspar®); Pegfilgrastim (Neulasta®); pemetrexed disodium (Alimta®); pentostatin (Nipent®); pipobroman (Vercyte®); plicamycin, mithramycin (Mithracin®); porfimer sodium (Photofrin®); procarbazine (Matulane®); quinacrine (Atabrine®); Rasburicase (Elitek®); Rituximab (Rituxan®); sargramostim (Leukine®); Sargramostim (Prokine®); sorafenib (Nexavar®); streptozocin (Zanosar®); sunitinib maleate (Sutent®); talc (Sclerosol®); tamoxifen (Nolvadex®); temozolomide (Temodar®); teniposide, VM-26 (Vumon®); testolactone (Teslac®); thioguanine, 6-TG (Thioguanine®); thiotepa (Thioplex®); topotecan (Hycamtin®); toremifene (Fareston®); Tositumomab (Bexxar®); Tositumomab/I-131 tositumomab (Bexxar®); Trastuzumab (Herceptin®); tretinoin, ATRA (Vesanoid®); Uracil Mustard (Uracil Mustard Capsules®); valrubicin (Valstar®); vinblastine (Velban®); vincristine (Oncovin®); vinorelbine (Navelbine®); zoledronate (Zometa®) and vorinostat (Zolinza®).

For a comprehensive discussion of updated cancer therapies see, http://www.nci.nih.gov/, a list of the FDA approved oncology drugs at http://www.fda.gov/cder/cancer/druglistframe.htm, and The Merck Manual, Seventeenth Ed. 1999, the entire contents of which are hereby incorporated by reference.

Compositions for Administration into a Subject

The ATR kinase inhibitors or pharmaceutical salts thereof may be formulated into pharmaceutical compositions for administration to animals or humans. These pharmaceutical compositions, which comprise an amount of the ATR inhibitor effective to treat or prevent the diseases or conditions described herein and a pharmaceutically acceptable carrier, are another embodiment of the present invention.

The exact amount of compound required for treatment will vary from subject to subject, depending on the species, age, and general condition of the subject, the severity of the infection, the particular agent, its mode of administration, and the like. The compounds of the invention are preferably formulated in dosage unit form for ease of administration and uniformity of dosage. The expression “dosage unit form” as used herein refers to a physically discrete unit of agent appropriate for the patient to be treated. It will be understood, however, that the total daily usage of the compounds and compositions of the present invention will be decided by the attending physician within the scope of sound medical judgment. The specific effective dose level for any particular patient or organism will depend upon a variety of factors including the disorder being treated and the severity of the disorder; the activity of the specific compound employed; the specific composition employed; the age, body weight, general health, sex and diet of the patient; the time of administration, route of administration, and rate of excretion of the specific compound employed; the duration of the treatment; drugs used in combination or coincidental with the specific compound employed, and like factors well known in the medical arts. The term “patient”, as used herein, means an animal, preferably a mammal, and most preferably a human.

In some embodiments, these compositions optionally further comprise one or more additional therapeutic agents. For example, chemotherapeutic agents or other anti-proliferative agents may be combined with the compounds of this invention to treat proliferative diseases and cancer. Examples of known agents with which these compositions can be combined are listed above under the “Combination Therapies” section and also throughout the specification. Some embodiments provide a simultaneous, separate or sequential use of a combined preparation.

Modes of Administration and Dosage Forms

The pharmaceutically acceptable compositions of this invention can be administered to humans and other animals orally, rectally, parenterally, intracisternally, intravaginally, intraperitoneally, topically (as by powders, ointments, or drops), bucally, as an oral or nasal spray, or the like, depending on the severity of the infection being treated. In certain embodiments, the compounds of the invention may be administered orally or parenterally at dosage levels of about 0.01 mg/kg to about 50 mg/kg and preferably from about 1 mg/kg to about 25 mg/kg, of subject body weight per day, one or more times a day, to obtain the desired therapeutic effect.

Liquid dosage forms for oral administration include, but are not limited to, pharmaceutically acceptable emulsions, microemulsions, solutions, suspensions, syrups and elixirs. In addition to the active compounds, the liquid dosage forms may contain inert diluents commonly used in the art such as, for example, water or other solvents, solubilizing agents and emulsifiers such as ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1,3-butylene glycol, dimethylformamide, oils (in particular, cottonseed, groundnut, corn, germ, olive, castor, and sesame oils), glycerol, tetrahydrofurfuryl alcohol, polyethylene glycols and fatty acid esters of sorbitan, and mixtures thereof. Besides inert diluents, the oral compositions can also include adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, and perfuming agents.

Injectable preparations, for example, sterile injectable aqueous or oleaginous suspensions may be formulated according to the known art using suitable dispersing or wetting agents and suspending agents. The sterile injectable preparation may also be a sterile injectable solution, suspension or emulsion in a nontoxic parenterally acceptable diluent or solvent, for example, as a solution in 1,3-butanediol. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution, U.S.P. and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose any bland fixed oil can be employed including synthetic mono- or diglycerides. In addition, fatty acids such as oleic acid are used in the preparation of injectables.

The injectable formulations can be sterilized, for example, by filtration through a bacterial-retaining filter, or by incorporating sterilizing agents in the form of sterile solid compositions which can be dissolved or dispersed in sterile water or other sterile injectable medium prior to use.

In order to prolong the effect of a compound of the present invention, it is often desirable to slow the absorption of the compound from subcutaneous or intramuscular injection. This may be accomplished by the use of a liquid suspension of crystalline or amorphous material with poor water solubility. The rate of absorption of the compound then depends upon its rate of dissolution that, in turn, may depend upon crystal size and crystalline form. Alternatively, delayed absorption of a parenterally administered compound form is accomplished by dissolving or suspending the compound in an oil vehicle. Injectable depot forms are made by forming microencapsule matrices of the compound in biodegradable polymers such as polylactide-polyglycolide. Depending upon the ratio of compound to polymer and the nature of the particular polymer employed, the rate of compound release can be controlled. Examples of other biodegradable polymers include poly(orthoesters) and poly(anhydrides). Depot injectable formulations are also prepared by entrapping the compound in liposomes or microemulsions that are compatible with body tissues.

Compositions for rectal or vaginal administration are preferably suppositories which can be prepared by mixing the compounds of this invention with suitable non-irritating excipients or carriers such as cocoa butter, polyethylene glycol or a suppository wax which are solid at ambient temperature but liquid at body temperature and therefore melt in the rectum or vaginal cavity and release the active compound.

Solid dosage forms for oral administration include capsules, tablets, pills, powders, and granules. In such solid dosage forms, the active compound is mixed with at least one inert, pharmaceutically acceptable excipient or carrier such as sodium citrate or dicalcium phosphate and/or a) fillers or extenders such as starches, lactose, sucrose, glucose, mannitol, and silicic acid, b) binders such as, for example, carboxymethylcellulose, alginates, gelatin, polyvinylpyrrolidinone, sucrose, and acacia, c) humectants such as glycerol, d) disintegrating agents such as agar-agar, calcium carbonate, potato or tapioca starch, alginic acid, certain silicates, and sodium carbonate, e) solution retarding agents such as paraffin, f) absorption accelerators such as quaternary ammonium compounds, g) wetting agents such as, for example, cetyl alcohol and glycerol monostearate, h) absorbents such as kaolin and bentonite clay, and i) lubricants such as talc, calcium stearate, magnesium stearate, solid polyethylene glycols, sodium lauryl sulfate, and mixtures thereof. In the case of capsules, tablets and pills, the dosage form may also comprise buffering agents.

Solid compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugar as well as high molecular weight polyethylene glycols and the like. The solid dosage forms of tablets, dragees, capsules, pills, and granules can be prepared with coatings and shells such as enteric coatings and other coatings well known in the pharmaceutical formulating art. They may optionally contain opacifying agents and can also be of a composition that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner. Examples of embedding compositions that can be used include polymeric substances and waxes. Solid compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugar as well as high molecular weight polyethylene glycols and the like.

The active compounds can also be in microencapsulated form with one or more excipients as noted above. The solid dosage forms of tablets, dragees, capsules, pills, and granules can be prepared with coatings and shells such as enteric coatings, release controlling coatings and other coatings well known in the pharmaceutical formulating art. In such solid dosage forms the active compound may be admixed with at least one inert diluent such as sucrose, lactose or starch. Such dosage forms may also comprise, as is normal practice, additional substances other than inert diluents, e.g., tableting lubricants and other tableting aids such a magnesium stearate and microcrystalline cellulose. In the case of capsules, tablets and pills, the dosage forms may also comprise buffering agents. They may optionally contain opacifying agents and can also be of a composition that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner. Examples of embedding compositions that can be used include polymeric substances and waxes.

Dosage forms for topical or transdermal administration of a compound of this invention include ointments, pastes, creams, lotions, gels, powders, solutions, sprays, inhalants or patches. The active component is admixed under sterile conditions with a pharmaceutically acceptable carrier and any needed preservatives or buffers as may be required. Ophthalmic formulation, eardrops, and eye drops are also contemplated as being within the scope of this invention. Additionally, the present invention contemplates the use of transdermal patches, which have the added advantage of providing controlled delivery of a compound to the body. Such dosage forms can be made by dissolving or dispensing the compound in the proper medium. Absorption enhancers can also be used to increase the flux of the compound across the skin. The rate can be controlled by either providing a rate controlling membrane or by dispersing the compound in a polymer matrix or gel.

The compositions of the present invention may be administered orally, parenterally, by inhalation spray, topically, rectally, nasally, buccally, vaginally or via an implanted reservoir. The term “parenteral” as used herein includes, but is not limited to, subcutaneous, intravenous, intramuscular, intra-articular, intra-synovial, intrasternal, intrathecal, intrahepatic, intralesional and intracranial injection or infusion techniques. Preferably, the compositions are administered orally, intraperitoneally or intravenously.

Sterile injectable forms of the compositions of this invention may be aqueous or oleaginous suspension. These suspensions may be formulated according to techniques known in the art using suitable dispersing or wetting agents and suspending agents. The sterile injectable preparation may also be a sterile injectable solution or suspension in a non-toxic parenterally-acceptable diluent or solvent, for example as a solution in 1,3-butanediol. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose, any bland fixed oil may be employed including synthetic mono- or di-glycerides. Fatty acids, such as oleic acid and its glyceride derivatives are useful in the preparation of injectables, as are natural pharmaceutically-acceptable oils, such as olive oil or castor oil, especially in their polyoxyethylated versions. These oil solutions or suspensions may also contain a long-chain alcohol diluent or dispersant, such as carboxymethyl cellulose or similar dispersing agents which are commonly used in the formulation of pharmaceutically acceptable dosage forms including emulsions and suspensions. Other commonly used surfactants, such as Tweens, Spans and other emulsifying agents or bioavailability enhancers which are commonly used in the manufacture of pharmaceutically acceptable solid, liquid, or other dosage forms may also be used for the purposes of formulation.

The pharmaceutical compositions of this invention may be orally administered in any orally acceptable dosage form including, but not limited to, capsules, tablets, aqueous suspensions or solutions. In the case of tablets for oral use, carriers commonly used include, but are not limited to, lactose and corn starch. Lubricating agents, such as magnesium stearate, are also typically added. For oral administration in a capsule form, useful diluents include lactose and dried cornstarch. When aqueous suspensions are required for oral use, the active ingredient is combined with emulsifying and suspending agents. If desired, certain sweetening, flavoring or coloring agents may also be added.

Alternatively, the pharmaceutical compositions of this invention may be administered in the form of suppositories for rectal administration. These can be prepared by mixing the agent with a suitable non-irritating excipient that is solid at room temperature but liquid at rectal temperature and therefore will melt in the rectum to release the drug. Such materials include, but are not limited to, cocoa butter, beeswax and polyethylene glycols.

The pharmaceutical compositions of this invention may also be administered topically, especially when the target of treatment includes areas or organs readily accessible by topical application, including diseases of the eye, the skin, or the lower intestinal tract. Suitable topical formulations are readily prepared for each of these areas or organs.

Topical application for the lower intestinal tract can be effected in a rectal suppository formulation (see above) or in a suitable enema formulation. Topically-transdermal patches may also be used.

For topical applications, the pharmaceutical compositions may be formulated in a suitable ointment containing the active component suspended or dissolved in one or more carriers. Carriers for topical administration of the compounds of this invention include, but are not limited to, mineral oil, liquid petrolatum, white petrolatum, propylene glycol, polyoxyethylene, polyoxypropylene compound, emulsifying wax and water. Alternatively, the pharmaceutical compositions can be formulated in a suitable lotion or cream containing the active components suspended or dissolved in one or more pharmaceutically acceptable carriers. Suitable carriers include, but are not limited to, mineral oil, sorbitan monostearate, polysorbate 60, cetyl esters wax, cetearyl alcohol, 2-octyldodecanol, benzyl alcohol and water.

For ophthalmic use, the pharmaceutical compositions may be formulated as micronized suspensions in isotonic, pH adjusted sterile saline, or, preferably, as solutions in isotonic, pH adjusted sterile saline, either with or without a preservative such as benzylalkonium chloride. Alternatively, for ophthalmic uses, the pharmaceutical compositions may be formulated in an ointment such as petrolatum.

The pharmaceutical compositions of this invention may also be administered by nasal aerosol or inhalation. Such compositions are prepared according to techniques well-known in the art of pharmaceutical formulation and may be prepared as solutions in saline, employing benzyl alcohol or other suitable preservatives, absorption promoters to enhance bioavailability, fluorocarbons, and/or other conventional solubilizing or dispersing agents.

The amount of protein kinase inhibitor that may be combined with the carrier materials to produce a single dosage form will vary depending upon the host treated, the particular mode of administration. Preferably, the compositions should be formulated so that a dosage of between 0.01-100 mg/kg body weight/day of the inhibitor can be administered to a patient receiving these compositions.

It should also be understood that a specific dosage and treatment regimen for any particular patient will depend upon a variety of factors, including the activity of the specific compound employed, the age, body weight, general health, sex, diet, time of administration, rate of excretion, drug combination, and the judgment of the treating physician and the severity of the particular disease being treated. The amount of inhibitor will also depend upon the particular compound in the composition.

Administering with Another Agent

Depending upon the particular protein kinase-mediated conditions to be treated or prevented, additional drugs, which are normally administered to treat or prevent that condition, may be administered together with the compounds of this invention.

Those additional agents may be administered separately, as part of a multiple dosage regimen, from the protein kinase inhibitor-containing compound or composition. Alternatively, those agents may be part of a single dosage form, mixed together with the protein kinase inhibitor in a single composition.

Another aspect of this invention is directed towards a method of treating cancer in a subject in need thereof, comprising the sequential or co-administration of a compound of this invention or a pharmaceutically acceptable salt thereof, and an anti-cancer agent. In some embodiments, said anti-cancer agent is selected from Platinating agents, such as Cisplatin, Oxaliplatin, Carboplatin, Nedaplatin, or Satraplatin and other derivatives; Topo I inhibitors, such as Camptothecin, Topotecan, irinotecan/SN38, rubitecan and other derivatives; Antimetabolites, such as Folic family (Methotrexate, Pemetrexed and relatives); Purine family (Thioguanine, Fludarabine, Cladribine, 6-Mercaptopurine and relatives); Pyrimidine family (Cytarabine, Gemcitabine, 5-Fluorouracil and relatives); Alkylating agents, such as Nitrogen mustards (Cyclophosphamide, Melphalan, Chlorambucil, mechlorethamine, Ifosfamide, and relatives); nitrosoureas (e.g. Carmustine); Triazenes (Dacarbazine, temozolomide); Alkyl sulphonates (e.g. Busulfan); Procarbazine and Aziridines; Antibiotics, such as Hydroxyurea; Anthracyclines (doxorubicin, daunorubicin, epirubicin and other derivatives); Anthracenediones (Mitoxantrone and relatives); Streptomyces family (Bleomycin, Mitomycin C, actinomycin) and Ultraviolet light.

Biological Samples

As inhibitors of ATR kinase, the compounds and compositions of this invention are also useful in biological samples. One aspect of the invention relates to inhibiting ATR kinase activity in a biological sample, which method comprises contacting said biological sample with a compound described herein or a composition comprising said compound. The term “biological sample”, as used herein, means an in vitro or an ex vivo sample, including, without limitation, cell cultures or extracts thereof; biopsied material obtained from a mammal or extracts thereof; and blood, saliva, urine, feces, semen, tears, or other body fluids or extracts thereof. The term “compounds described herein” includes compounds of formula I, II, III, IV, IA, IIA, IIIA, IVA, IA-i, IA-ii, IA-iii, V, VI, and VII.

Inhibition of ATR kinase activity in a biological sample is useful for a variety of purposes that are known to one of skill in the art. Examples of such purposes include, but are not limited to, blood transfusion, organ-transplantation, and biological specimen storage.

Study of Protein Kinases

Another aspect of this invention relates to the study of protein kinases in biological and pathological phenomena; the study of intracellular signal transduction pathways mediated by such protein kinases; and the comparative evaluation of new protein kinase inhibitors. Examples of such uses include, but are not limited to, biological assays such as enzyme assays and cell-based assays.

The activity of the compounds as protein kinase inhibitors may be assayed in vitro, in vivo or in a cell line. In vitro assays include assays that determine inhibition of either the kinase activity or ATPase activity of the activated kinase. Alternate in vitro assays quantitate the ability of the inhibitor to bind to the protein kinase and may be measured either by radiolabelling the inhibitor prior to binding, isolating the inhibitor/kinase complex and determining the amount of radiolabel bound, or by running a competition experiment where new inhibitors are incubated with the kinase bound to known radioligands. Detailed conditions for assaying a compound utilized in this invention as an inhibitor of ATR is set forth in the Examples below.

Another aspect of the invention provides a method for modulating enzyme activity by contacting a compound described herein with ATR kinase.

Methods of Treatment

In one aspect, the present invention provides a method for treating or lessening the severity of a disease, condition, or disorder where ATR kinase is implicated in the disease state. In another aspect, the present invention provides a method for treating or lessening the severity of an ATR kinase disease, condition, or disorder where inhibition of enzymatic activity is implicated in the treatment of the disease. In another aspect, this invention provides a method for treating or lessening the severity of a disease, condition, or disorder with compounds that inhibit enzymatic activity by binding to the ATR kinase. Another aspect provides a method for treating or lessening the severity of a kinase disease, condition, or disorder by inhibiting enzymatic activity of ATR kinase with an ATR kinase inhibitor.

One aspect of the invention relates to a method of inhibiting ATR kinase activity in a patient, which method comprises administering to the patient a compound described herein, or a composition comprising said compound. In some embodiments, said method is used to treat or prevent a condition selected from proliferative and hyperproliferative diseases, such as cancer.

Another aspect of this invention provides a method for treating, preventing, or lessening the severity of proliferative or hyperproliferative diseases comprising administering an effective amount of a compound, or a pharmaceutically acceptable composition comprising a compound, to a subject in need thereof. In some embodiments, said subject is a patient. The term “patient”, as used herein, means an animal, preferably a human.

In some embodiments, said method is used to treat or prevent cancer. In some embodiments, said method is used to treat or prevent a type of cancer with solid tumors. In yet another embodiment, said cancer is selected from the following cancers: Oral: buccal cavity, lip, tongue, mouth, pharynx; Cardiac: sarcoma (angiosarcoma, fibrosarcoma, rhabdomyosarcoma, liposarcoma), myxoma, rhabdomyoma, fibroma, lipoma and teratoma; Lung: bronchogenic carcinoma (squamous cell or epidermoid, undifferentiated small cell, undifferentiated large cell, adenocarcinoma), alveolar (bronchiolar) carcinoma, bronchial adenoma, sarcoma, lymphoma, chondromatous hamartoma, mesothelioma; Gastrointestinal: esophagus (squamous cell carcinoma, larynx, adenocarcinoma, leiomyosarcoma, lymphoma), stomach (carcinoma, lymphoma, leiomyosarcoma), pancreas (ductal adenocarcinoma, insulinoma, glucagonoma, gastrinoma, carcinoid tumors, vipoma), small bowel or small intestines (adenocarcinoma, lymphoma, carcinoid tumors, Karposi's sarcoma, leiomyoma, hemangioma, lipoma, neurofibroma, fibroma), large bowel or large intestines (adenocarcinoma, tubular adenoma, villous adenoma, hamartoma, leiomyoma), colon, colon-rectum, colorectal; rectum, Genitourinary tract: kidney (adenocarcinoma, Wilm's tumor [nephroblastoma], lymphoma), bladder and urethra (squamous cell carcinoma, transitional cell carcinoma, adenocarcinoma), prostate (adenocarcinoma, sarcoma), testis (seminoma, teratoma, embryonal carcinoma, teratocarcinoma, choriocarcinoma, sarcoma, interstitial cell carcinoma, fibroma, fibroadenoma, adenomatoid tumors, lipoma); Liver: hepatoma (hepatocellular carcinoma), cholangiocarcinoma, hepatoblastoma, angiosarcoma, hepatocellular adenoma, hemangioma, biliary passages; Bone: osteogenic sarcoma (osteosarcoma), fibrosarcoma, malignant fibrous histiocytoma, chondrosarcoma, Ewing's sarcoma, malignant lymphoma (reticulum cell sarcoma), multiple myeloma, malignant giant cell tumor chordoma, osteochronfroma (osteocartilaginous exostoses), benign chondroma, chondroblastoma, chondromyxofibroma, osteoid osteoma and giant cell tumors; Nervous system: skull (osteoma, hemangioma, granuloma, xanthoma, osteitis deformans), meninges (meningioma, meningiosarcoma, gliomatosis), brain (astrocytoma, medulloblastoma, glioma, ependymoma, germinoma [pinealoma], glioblastoma multiform, oligodendroglioma, schwannoma, retinoblastoma, congenital tumors), spinal cord neurofibroma, meningioma, glioma, sarcoma); Gynecological: uterus (endometrial carcinoma), cervix (cervical carcinoma, pre-tumor cervical dysplasia), ovaries (ovarian carcinoma [serous cystadenocarcinoma, mucinous cystadenocarcinoma, unclassified carcinoma], granulosa-thecal cell tumors, Sertoli-Leydig cell tumors, dysgerminoma, malignant teratoma), vulva (squamous cell carcinoma, intraepithelial carcinoma, adenocarcinoma, fibrosarcoma, melanoma), vagina (clear cell carcinoma, squamous cell carcinoma, botryoid sarcoma (embryonal rhabdomyosarcoma), fallopian tubes (carcinoma), breast; Skin: malignant melanoma, basal cell carcinoma, squamous cell carcinoma, Karposi's sarcoma, keratoacanthoma, moles dysplastic nevi, lipoma, angioma, dermatofibroma, keloids, psoriasis, Thyroid gland: papillary thyroid carcinoma, follicular thyroid carcinoma; medullary thyroid carcinoma, multiple endocrine neoplasia type 2A, multiple endocrine neoplasia type 2B, familial medullary thyroid cancer, pheochromocytoma, paraganglioma; and Adrenal glands: neuroblastoma.

In some embodiments, the cancer is selected from the cancers described herein. In some embodiments, said cancer is lung cancer, head and neck cancer, pancreatic cancer, gastric cancer, or brain cancer.

In certain embodiments, an “effective amount” of the compound or pharmaceutically acceptable composition is that amount effective in order to treat said disease. The compounds and compositions, according to the method of the present invention, may be administered using any amount and any route of administration effective for treating or lessening the severity of said disease.

One aspect provides a method for inhibiting ATR in a patient comprising administering a compound described herein as described herein. Another embodiment provides a method of treating cancer comprising administering to a patient a compound described herein, wherein the variables are as defined herein.

Some embodiments comprising administering to said patient an additional therapeutic agent selected from a DNA-damaging agent; wherein said additional therapeutic agent is appropriate for the disease being treated; and said additional therapeutic agent is administered together with said compound as a single dosage form or separately from said compound as part of a multiple dosage form.

In some embodiments, said DNA-damaging agent is selected from ionizing radiation, radiomimetic neocarzinostatin, a platinating agent, a Topo I inhibitor, a Topo II inhibitor, an antimetabolite, an alkylating agent, an alkyl sulphonates, an antimetabolite, or an antibiotic. In other embodiments, said DNA-damaging agent is selected from ionizing radiation, a platinating agent, a Topo I inhibitor, a Topo II inhibitor, or an antibiotic.

Examples of Platinating agents include Cisplatin, Oxaliplatin, Carboplatin, Nedaplatin, Satraplatin and other derivatives. Other platinating agents include Lobaplatin, and Triplatin. Other platinating agents include Tetranitrate, Picoplatin, Satraplatin, ProLindac and Aroplatin.

Examples of Topo I inhibitor include Camptothecin, Topotecan, irinotecan/SN38, rubitecan and other derivatives. Other Topo I inhibitors include Belotecan.

Examples of Topo II inhibitors include Etoposide, Daunorubicin, Doxorubicin, Aclarubicin, Epirubicin, Idarubicin, Amrubicin, Pirarubicin, Valrubicin, Zorubicin and Teniposide.

Examples of Antimetabolites include members of the Folic family, Purine family (purine antagonists), or Pyrimidine family (pyrimidine antagonists). Examples of the Folic family include methotrexate, pemetrexed and relatives; examples of the Purine family include Thioguanine, Fludarabine, Cladribine, 6-Mercaptopurine, and relatives; examples of the Pyrimidine family include Cytarabine, gemcitabine, 5-Fluorouracil (5FU) and relatives.

Some other specific examples of antimetabolites include Aminopterin, Methotrexate, Pemetrexed, Raltitrexed, Pentostatin, Cladribine, Clofarabine, Fludarabine, Thioguanine, Mercaptopurine, Fluorouracil, Capecitabine, Tegafur, Carmofur, Floxuridine, Cytarabine, Gemcitabine, Azacitidine and Hydroxyurea.

Examples of alkylating agents include Nitrogen mustards, Triazenes, alkyl sulphonates, Procarbazine and Aziridines. Examples of Nitrogen mustards include Cyclophosphamide, Melphalan, Chlorambucil and relatives; examples of nitrosoureas include Carmustine; examples of triazenes include Dacarbazine and temozolomide; examples of alkyl sulphonates include Busulfan.

Other specific examples of alkylating agents include Mechlorethamine, Cyclophosphamide, Ifosfamide, Trofosfamide, Chlorambucil, Melphalan, Prednimustine, Bendamustine, Uramustine, Estramustine, Carmustine, Lomustine, Semustine, Fotemustine, Nimustine, Ranimustine, Streptozocin, Busulfan, Mannosulfan, Treosulfan, Carboquone, ThioTEPA, Triaziquone, Triethylenemelamine, Procarbazine, Dacarbazine, Temozolomide, Altretamine, Mitobronitol, Actinomycin, Bleomycin, Mitomycin and Plicamycin.

Examples of antibiotics include Mitomycin, Hydroxyurea; Anthracyclines, Anthracenediones, Streptomyces family. Examples of Anthracyclines include doxorubicin, daunorubicin, epirubicin and other derivatives; examples of Anthracenediones include Mitoxantrone and relatives; examples of Streptomyces family include Bleomycin, Mitomycin C, and actinomycin.

In certain embodiments, said platinating agent is Cisplatin or Oxaliplatin; said Topo I inhibitor is Camptothecin; said Topo II inhibitor is Etoposide; and said antibiotic is Mitomycin. In other embodiments, said platinating agent is selected from Cisplatin, Oxaliplatin, Carboplatin, Nedaplatin, or Satraplatin; said Topo I inhibitor is selected from Camptothecin, Topotecan, irinotecan/SN38, rubitecan; said Topo II inhibitor is selected from Etoposide; said antimetabolite is selected from a member of the Folic Family, the Purine Family, or the Pyrimidine Family; said alkylating agent is selected from nitrogen mustards, nitrosoureas, triazenes, alkyl sulfonates, Procarbazine, or aziridines; and said antibiotic is selected from Hydroxyurea, Anthracyclines, Anthracenediones, or Streptomyces family.

Another embodiment provides a method of promoting cell death in cancer cells comprising administering to a patient a compound described herein, or a composition comprising said compound.

Yet another embodiment provides a method of preventing cell repair of DNA damage in cancer cells comprising administering to a patient a compound described herein, or a composition comprising said compound. Yet another embodiment provides a method of preventing cell repair caused by of DNA damage in cancer cells comprising administering to a patient a compound of formula I, or composition comprising said compound.

Another embodiment provides a method of sensitizing cells to DNA damaging agents comprising administering to a patient a compound described herein, or a composition comprising said compound.

In some embodiments, the method is used on a cancer cell having defects in the ATM signaling cascade. In some embodiments, said defect is altered expression or activity of one or more of the following: ATM, p53, CHK2, MRE11, RAD50, NBS1, 53BP1, MDC1 or H2AX. In another embodiment, the cell is a cancer cell expressing DNA damaging oncogenes. In some embodiments, said cancer cell has altered expression or activity of one or more of the following: K-Ras, N-Ras, H-Ras, Raf, Myc, Mos, E2F, Cdc25A, CDC4, CDK2, Cyclin E, Cyclin A and Rb.

Yet another embodiment provides use of a compound described herein as a radio-sensitizer or a chemo-sensitizer.

Yet other embodiment provides use of a compound of formula I as a single agent (monotherapy) for treating cancer. In some embodiments, the compounds of formula I are used for treating patients having cancer with a DNA-damage response (DDR) defect. In other embodiments, said defect is a mutation or loss of ATM, p53, CHK2, MRE11, RAD50, NBS1, 53BP1, MDC1, or H2AX.

Schemes

The compounds of the disclosure may be prepared in light of the specification using steps generally known to those of ordinary skill in the art. Those compounds may be analyzed by known methods, including but not limited to LCMS (liquid chromatography mass spectrometry) and NMR (nuclear magnetic resonance). Below are a set of generic schemes that illustrate generally how to prepare the compounds of the present disclosure.

Cyclic amides compounds of the present disclosure wherein -L-R¹ is an aromatic amide can be prepared according to methods similar to the one depicted in Scheme I-A1: Commercially available ester 1 is reacted with a boronic acid under Suzuki conditions to give intermediate 2. The carboxylic acid group is engaged in a coupling reaction with an amine to lead to cyclic amide compounds of the Formula I.

Alternatively, compounds of the present disclosure wherein -L-R¹ is an aromatic amide can be prepared according to methods similar to the one depicted in Scheme I-A2, a variation of the synthetic sequence depicted in scheme I-A1 which consists in starting from methyl ester 1. Ester 1 is transformed into carboxylic acid 3 which is engaged in a coupling reaction with an amine to give amide 4. This is reacted with a boronic acid under Suzuki conditions to lead to compounds of formula I.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Compounds of the present disclosure where Ring A is a 1,3,4-oxadiazole can be prepared according to methods similar to the one depicted in Scheme I-B1: methyl ester 3 is reacted with a boronic acid under Suzuki conditions to give intermediate 8. The carboxylic acid in 8 is then engaged into a coupling reaction with an hydrazide (X═O) or thiohydrazide (X═S) to form 9. Finally, the acylhydrazide in 9 undergoes a cyclodehydration to lead to compounds of the present disclosure (formula I in Scheme I-B1). Transformation of intermediate 8 into compounds of formula I has also been performed in a one-pot procedure using reagents serving two purposes (coupling and cyclodehydration).

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Alternatively, compounds of the present disclosure where Ring A is a 1,3,4-oxadiazole can be prepared according to methods similar to the one depicted in Scheme I-B2, a variation of the synthetic sequence depicted in scheme I-B1. The hydrazide 5 is engaged in a coupling reaction with a carboxylic acid functional group to form intermediate 9 (X═O). As in scheme I-B1 the acylhydrazide then undergoes a cyclodehydration to lead to compounds of formula I. When R5 is a moiety bound to the oxadiazole ring through a C—N bond, then an thioisocyanate can be used to generate intermediate 9 (X═S); the thioacylhydrazide then undergoes a cyclodehydration to lead to compounds of formula I.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Alternatively, compounds of the present disclosure where Ring A is 1,3,4-oxadiazole can be prepared according to methods similar to the one depicted in Scheme I-B3: the R functional group in 10 or 6 (acid and hydrazide respectively, both prepared from methyl ester 3 through hydrolysis and hydrazinolysis respectively) are engaged into coupling with a suitable partner (R₅CXNHNH₂ when starting from 10; R₅COOH/R₅==S when starting from 6) to form acylhydrazide intermediate 11. Subsequent cyclodehydration leads to the compound 12 where the 1,3,4-oxadiazole ring has been constructed. Transformation of starting point 10 or 6 into intermediate 12 has also been performed in a one-pot procedure using reagents serving two purposes (coupling and cyclodehydration). The bromo handle in oxadiazole 12 is then reacted with a boronic acid under Suzuki conditions to give compounds of formula I. When R group in I contains a carboxylic acid moiety, it can be further transformed (eg into an amide) using conditions known in the art.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Compounds of the present disclosure where Ring A is a 1,2,4-oxadiazole can be prepared according to methods similar to the one depicted in Scheme I-C1: nitrile 2 reacts with hydroxylamine to give intermediate 13. The hydroxy group in 13 reacts with acid chlorides to lead to intermediate 14 which undergoes cyclodehydration to afford compounds of formula I.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Alternatively, compounds of the present disclosure where Ring A is a 1,2,4-oxadiazole can be prepared according to methods similar to the one depicted in Scheme I-C2: Commercially available nitrile 1 reacts with hydroxylamine to give intermediate 15. The hydroxy group in 15 reacts with acid chlorides to lead to intermediate 16 which undergoes cyclodehydration to afford intermediate 17. The bromo handle in 17 is then used to perform a Suzuki reaction with a boronic acid coupling partner to give compounds of formula I. When R group in I contains a carboxylic acid moiety, it can be further transformed (eg into an amide) using conditions known in the art.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Compounds of the present disclosure where Ring A is a 1,3,4-thiadiazole can be prepared according to methods similar to the one depicted in Scheme I-D1: methyl ester 3 is reacted with a boronic acid under Suzuki conditions to give intermediate 8. The carboxylic acid in 8 is then engaged into a coupling reaction with a thiohydrazide to form 18. Finally, the thioacylhydrazide in 18 undergoes a cyclodehydration to lead to compounds of formula I. Transformation of intermediate 8 into compounds of formula I can be performed in a one-pot procedure using reagents serving two purposes (coupling and cyclodehydration)

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Alternatively, compounds of the present disclosure where Ring A is 1,3,4-thiadiazole can be prepared according to methods similar to the one depicted in Scheme I-D2: the acid functional group in 10 is engaged into coupling with a suitable partner (R₅CSNHNH₂) to form the thioacylhydrazide intermediate 19. Subsequent cyclodehydration leads to the compound 20 where the 1,3,4-thiadiazole ring has been constructed. Transformation of starting point 10 into 20 has been performed in a one-pot procedure using reagents serving two purposes (coupling and cyclodehydration). The bromo handle in thiadiazole 20 is then reacted with a boronic acid under Suzuki conditions to give compounds of formula I. When R group in I contains a carboxylic acid moiety, it can be further transformed (eg into an amide) using conditions known in the art.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Compounds of the present disclosure where Ring A is an isoxazole can be prepared according to methods similar to the one depicted in Scheme I-E1: Commercially available 2-amino-3,5-dibromo pyrazine 21 undergoes a Sonogashira coupling with TMS-acetylene to give intermediate 22, the amino group of which can be fully protected as the diBoc species 23. A Suzuki coupling with the remaining bromo handle, with concommitent TMS deprotection affords intermediate 24. The alkyne 24 finally reacts in a cyclocondensation with N-hydroxyaroyl chloride to furnish compounds of Formula I.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Alternatively, compounds of the present disclosure where Ring A is an isoxazole can be prepared according to methods similar to the one depicted in Scheme I-E2: The TMS-protected intermediate 23, described in scheme I-E1 can be deprotected to reveal the alkyne compound 25. The alkyne 25 reacts in a cyclocondensation with N-hydroxyaroyl chloride to furnish intermediate 26 where the isoxazole ring has been constructed. The bromo handle in isoxazole 26 is then reacted with a boronic acid under Suzuki conditions to give compounds 27. A final deprotection of N-protecting groups in 27 can reveal compounds of Formula I. When R group in I contains a carboxylic acid moiety, it can be further transformed (eg into an amide) using conditions known in the art.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Alternatively, compounds of the present disclosure where Ring A is a 1,2,4-triazole can be prepared according to methods similar to the one depicted in Scheme I-F1 starting from methyl ester 3. Ester 3 is reacted with a boronic acid under Suzuki conditions to give intermediate 4. When R group contains a carboxylic acid moiety, it can be further transformed at this stage (eg into an amide) using conditions known in the art. The methyl ester group in 4 is then transformed into an hydrazide by reaction with hydrazine to give 5. Finally, the hydrazide group in 5 is engaged in a coupling reaction with a nitrile and subsequently undergoes a cyclodehydration to lead to compounds of formula I.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Alternatively, compounds of the present disclosure where Ring A is a 1,2,4-triazole can be prepared according to methods similar to the one depicted in Scheme I-F2: the R functional group in 1 or 3 (nitrile and methyl ester respectively) are engaged into coupling (after appropriate transformation of 3 into hydrazide 6) with a suitable coupling partner (R₅CONHNH₂ when starting from 1; R₅CN if using 6). Subsequent cyclodehydration leads to the intermediate 7 where the 1,2,4-triazole ring has been constructed. The bromo handle in triazole 7 is then reacted with a boronic acid under Suzuki conditions to give compounds of formula I. When R group in I contains a carboxylic acid moiety, it can be further transformed (eg into an amide) using conditions known in the art.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Benzoxazole compounds of Formula VI can be prepared according to methods similar to the one depicted in Scheme I-G1: Commercially available nitrile 1 is reacted with a amino phenol to give the benzoxazole which is then reacted with a boronic acid under Suzuki conditions to give compounds of the formula VI.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Benzothiazole compounds of Formula VI can be prepared according to methods similar to the one depicted in Scheme I-H1: Commercially available nitrile 1 is reacted with a aminobenzenethiol to give the benzothiazole which is then reacted with a boronic acid under Suzuki conditions to give compounds of the formula VI.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Alternatively, benzothiazole compounds of Formula VI can be prepared according to Scheme I-H2; methyl ester 3 is reacted with a boronic acid under Suzuki conditions to give intermediate 8. Cyclisation of intermediate 8 with an amino benzenethiol will lead to compounds of the formula VI.

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Benzimidazole compounds of Formula I can be prepared according to methods similar to the one depicted in Scheme I-I1: methyl ester 3 is reacted with a boronic acid under Suzuki conditions to give intermediate 8. Cyclisation of intermediate 8 with a benzene 1,2-diamine will lead to compounds of the formula I

wherein R is -(L-NR¹R²)_(p) or -(J₂)_(q)

Alternatively, benzimidazole compounds of Formula I can be prepared according to methods similar to the one depicted in Scheme 1-12: Reaction of the acid functional group of 3 is reacted with a benzene 1,2-diamine to give the benzimidazole intermediate 9. Intermediate 9 is then reacted with a boronic acid under Suzuki conditions to give compounds of the formula I.

EXAMPLES

It should be understood that the specific conditions shown below are only examples, and are not meant to limit the scope of the conditions that can be used for making, analyzing, or testing the compounds of the disclosure. Instead, this invention also includes conditions known to those skilled in that art for making, analyzing, and testing the compounds of the disclosure.

HPLC Methods

As used herein, the term “Rt(min)” refers to the HPLC retention time, in minutes, associated with the compound. Unless otherwise indicated, the HPLC method utilized to obtain the reported retention time is as follows:

Column: ACE C8 column, 4.6×150 mm

Gradient: 0-100% acetonitrile+methanol 60:40 (20 mM Tris phosphate)

Flow rate: 1.5 mL/minute

Detection: 225 nm.

HNMR Methods

¹H-NMR spectra were recorded at 400 MHz using a Bruker DPX 400 instrument.

Mass Spectrometry Methods

Mass spec. samples were analyzed on a MicroMass Quattro Micro mass spectrometer operated in single MS mode with electrospray ionization. Samples were introduced into the mass spectrometer using chromatography. Mobile phase for all mass spec. analyses consisted of 10 mM pH 7 ammonium acetate and a 1:1 acetonitrile-methanol mixture, column gradient conditions are 5%-100% acetonitrile-methanol over 3.5 mins gradient time and 5 mins run time on an ACE C8 3.0×75 mm column. Flow rate is 1.2 ml/min.

The following compounds were prepared and analyzed as follows.

Example 1: 3-amino-6-(4-methoxyphenyl)-N-phenylpyrazine-2-carboxamide (Compound I-1)

Method A Step 1: Methyl 3-amino-6-bromopyrazine-2-carboxylate

A mixture of methyl 3-aminopyrazine-2-carboxylate (8.35 g, 54.53 mmol) and N-bromo-succinimide (9.705 g, 54.53 mmol) was stirred in MeCN (100 mL) at room temp overnight. The resultant precipitate was filtered, washed with MeCN and dried to give the desired product as a yellow solid (11.68 g, 92% Yield)

1H NMR (400.0 MHz, DMSO) 3.85 (s, 3H), 7.55 (br s, 2H) and 8.42 (s, 1H) ppm; MS (ES⁺) 233

Step 2: 3-amino-6-bromopyrazine-2-carboxylic acid

A mixture of methyl 3-amino-6-bromo-pyrazine-2-carboxylate (5.11 g, 22.02 mmol) and lithium hydroxide (2.637 g, 110.1 mmol) in MeOH (20 mL) and H2O (20 mL) was heated to 90° C. for 2 hours. The reaction mixture was allowed to cool and neutralised with HCl and the resultant precipitate collected by filtration. Taken on to the next step without further purification (4.80 g, 99% Yield).

Step 3: 3-amino-6-bromo-N-phenylpyrazine-2-carboxamide

A mixture of 3-amino-6-bromo-pyrazine-2-carboxylic acid (3.5 g, 16.05 mmol), 1,1′-carbonyldiimidazole (5.205 g, 32.10 mmol), DIPEA (2.282 g, 3.075 mL, 17.66 mmol) and DMAP (98.04 mg, 0.8025 mmol) were combined in DMSO (131.2 mL) and stirred for 30 min. Aniline (1.495 g, 1.463 mL, 16.05 mmol) was then added and the resulting solution stirred at RT for 18 hours. After this time water was added and the product collected by filtration to give a brown powder (3.5 g, 74% Yield).

1H NMR (400.0 MHz, DMSO) δ 7.04 (1H, m), 7.29 (2H, m), 7.72 (4H, m), 8.36 (1H, s), 10.22 (NH₂) ppm; MS (ES⁺) 295.

Step 4: 3-amino-6-(4-methoxyphenyl)-N-phenylpyrazine-2-carboxamide (Compound I-1)

A Greenhouse tube was charged with 4-Methoxyphenylboronic acid (31.4 mg, 0.207 mmol) and treated with a solution of dichloropalladium:triphenylphosphane (4.84 mg, 0.0069 mmol) and 3-amino-6-bromo-N-phenyl-pyrazine-2-carboxamide (40.45 mg, 0.138 mmol) in DMF (0.81 mL) followed by Na₂CO₃ (2M solution, 207 uL, 0.414 mmol). The mixture was flushed with nitrogen and heated to 88° C. for 18 hours. After this time the reaction was filtered to remove inorganics and the resultant residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 uM, 100 A column, gradient 10%-95% B (solvent A: 0.05% TFA in water, solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were freeze-dried to give the title compound as a solid (18.56 mg, 38% Yield). MS (ES⁺) 321

Compounds I-1 to I-41 were prepared using Method A

Compound I-2: 3-amino-6-(3-cyanopyridin-4-yl)-N-phenylpyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 7.17 (t, J=7.3 Hz, 1H), 7.39-7.43 (m, 2H), 7.81-7.83 (m, 2H), 8.30 (d, J=5.4 Hz, 2H), 8.40 (s, 1H), 8.91 (d, J=5.5 Hz, 1H), 9.13 (s, 1H), 9.17 (s, 1H) and 10.16 (s, 1H) ppm; MS (ES⁺) 317

Compound I-3:_3-amino-N-phenyl-6-(4-(2-(piperidin-1-yl) ethyl carbamoyl)phenyl) pyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 3.35 (s, 3H), 7.17 (t, J=7.4 Hz, 1H), 7.43-7.39 (m, 2H), 7.78 (t, J=7.8 Hz, 2H), 7.82 (d, J=7.7 Hz, 2H), 7.92-7.94 (m, 1H), 8.60-8.66 (m, 2H), 9.05 (s, 1H) and 10.50 (s, 1H) ppm; MS (ES⁺) 369.

Compound I-4:_3-amino-6-(4-fluorophenyl)-N-phenylpyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 7.16 (t, J=7.3 Hz, 1H), 7.32 (t, J=8.9 Hz, 2H), 7.38-7.42 (m, 2H), 7.69 (s, 2H), 7.81-7.83 (m, 2H), 8.28-8.31 (m, 2H), 8.92 (s, 1H), 10.42 (s, 1H) ppm; MS (ES⁺) 309

Compound I-5: 3-amino-6-(4-(methylsulfonamido)phenyl)-N-phenylpyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 7.16 (t, J=7.4 Hz, 1H), 7.33 (d, J=8.7 Hz, 2H), 7.38-7.42 (m, 2H), 7.65 (s, 2H), 7.83 (d, J=7.6 Hz, 2H), 8.21 (d, J=8.7 Hz, 2H), 8.90 (s, 1H), 9.92 (s, 1H), 10.37 (s, 1H) ppm; MS (ES⁺) 384

Compound I-6: 3-amino-N-phenyl-6-(2-(trifluoromethyl)phenyl)pyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 7.11-7.16 (m, 1H), 7.36-7.40 (m, 2H), 7.69-7.72 (m, 3H), 7.80-7.84 (m, 4H), 7.93 (d, J=7.8 Hz, 1H), 8.52 (s, 1H), 10.12 (s, 1H) ppm; MS (ES⁺) 359

Compound I-7: 4-(5-amino-6-(phenylcarbamoyl)pyrazin-2-yl)benzoic acid 1H NMR (400 MHz, DMSO) 7.17 (1H, t), 7.41 (2H, t), 7.83 (4H, d), 8.03 (2H, d), 8.37 (2H, d), 9.01 (1H, s), 10.45 (1H, s), 13.03 (1H, br s) ppm; MS (ES⁺) 335

Compound I-8: 3-(5-amino-6-(phenylcarbamoyl)pyrazin-2-yl)benzoic acid 1H NMR (400 MHz, DMSO) 7.16 (1H, t), 7.38-7.42 (3H, m), 7.64 (2H, br s), 7.81 (2H, d), 7.88 (1H, d), 8.17 (1H, d), 8.46 (1H, d), 8.85 (1H, s), 10.39 (1H, s) ppm; MS (ES⁺) 335

Compound I-9: 3-amino-6-(3-fluorophenyl)-N-phenylpyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 7.15-7.25 (m, 2H), 7.40 (dd, J=1.7, 15.9 Hz, 1H), 7.41 (s, 1H), 7.52 (td, J=8.0, 4.7 Hz, 1H), 7.80-7.82 (m, 4H), 8.06 (d, J=8.0 Hz, 8.17-8.20 (m, 1H), 8.97 (s, 1H), 10.46 (s, 1H) ppm; MS (ES⁺) 309

Compound I-10: 3-amino-6-(3-cyanophenyl)-N-phenylpyrazine-2-carboxamide MS (ES⁺) 316

Compound I-11: 3-amino-N-phenyl-6-o-tolylpyrazine-2-carboxamide MS (ES⁺) 305

Compound I-12: 3-amino-6-(3-morpholinophenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 376

Compound I-13: 3-amino-6-(4-morpholinophenyl)-N-phenylpyrazine-2-carboxamide MS (ES+) 376

Compound I-14: 3-amino-6-(2-fluorophenyl)-N-phenylpyrazine-2-carboxamide MS (ES⁺) 309

Compound I-15: 3-amino-N,6-diphenylpyrazine-2-carboxamide; MS (ES⁺) 291

Compound I-16: 3-amino-6-(4-(hydroxymethyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 321

Compound I-17: 6-(4-acetylphenyl)-3-amino-N-phenylpyrazine-2-carboxamide MS (ES⁺) 333

Compound I-18: 3-amino-6-(3-carbamoylphenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 334

Compound I-19: 3-amino-6-(2-(hydroxymethyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 321

Compound I-20: 3-amino-6-(3-(morpholine-4-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 404

Compound I-21: 3-amino-6-(4-cyanophenyl)-N-phenylpyrazine-2-carboxamide MS (ES⁺) 316

Compound I-22: 6-(3-acetylphenyl)-3-amino-N-phenylpyrazine-2-carboxamide MS (ES⁺) 333

Compound I-23: 3-amino-6-(4-(2-(4-hydroxypiperidin-1-yl)acetyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 432

Compound I-24: 3-amino-6-(4-(dimethylcarbamoyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 362

Compound I-25: 3-amino-6-(3-(methylsulfonamido)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 384

Compound I-26: 3-amino-6-(3-(morpholine-4-carbonyl)phenyl)-N-(4-(pyrrolidin-1-yl)phenyl)pyrazine-2-carboxamide; MS (ES+) 473

Compound I-27:_3-amino-6-(3-carbamoylphenyl)-N-(2-methoxyphenyl)pyrazine-2-carboxamide; MS (ES+) 364

Compound I-28: 3-amino-6-(4-(dimethylcarbamoyl)phenyl)-N-(2-methoxyphenyl) pyrazine-2-carboxamide; MS (ES+) 392

Compound I-29: 3-amino-6-(1H-indol-5-yl)-N-(2-methoxyphenyl)pyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 4.03 (s, 3H), 6.55 (d, J=1.9 Hz, 1H), 7.03-7.05 (m, 1H), 7.13-7.19 (m, 2H), 7.43 (t, J=2.7 Hz, 1H), 7.55 (d, J=8.6 Hz, 2H), 7.87 (dd, J=1.6, 8.6 Hz, 1H), 8.31 (s, 1H), 8.39 (dd, J=1.4, 7.9 Hz, 1H), 8.99 (s, 1H), 10.85 (s, 1H) and 11.27 (s, 1H) ppm; MS (ES⁺) 360

Compound I-30: 3-amino-6-(furan-2-yl)-N-(2-methoxyphenyl)pyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 3.98 (s, 3H), 6.56 (s, 1H), 6.69 (s, 1H), 7.00-7.03 (m, 2H), 7.15 (s, 1H), 7.86 (br s, 2H), 7.86 (s, 1H), 8.32 (d, 1H), 8.72 (s, 1H) and 10.51 (s, 1H) ppm; MS (ES⁺) 311

Compound I-31: 3-amino-N-phenyl-6-(1H-pyrazol-5-yl)pyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 6.98 (d, J=10.5 Hz, 1H), 7.18 (t, J=7.4 Hz, 1H), 7.40-7.44 (m, 2H), 7.67 (s, 3H), 7.81 (d, J=7.7 Hz, 2H), 8.83 (s, 1H), 10.54 (s, 1H) and 13.80 (s, 1H) ppm; MS (ES⁺) 281

Compound I-32: 3-amino-6-(6-hydroxypyridin-3-yl)-N-phenylpyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 6.45 (d, J=9.6 Hz, 1H), 7.14-7.18 (m, 1H), 7.38-7.42 (m, 2H), 7.58 (s, 2H), 7.78-7.80 (m, 2H), 8.31 (d, J=2.5 Hz, 1H), 8.39 (dd, J=2.6, 9.6 Hz, 1H), 8.79 (s, 1H), 10.42 (s, 1H) and 12.00 (s, 1H) ppm; MS (ES⁺) 308

Compound I-33: 3-amino-N-phenyl-6-(pyridin-4-yl)pyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 7.18 (t, J=7.5 Hz, 1H), 7.41 (dd, J=1.8, 14.1 Hz, 2H), 7.82 (dd, J=0.8, 8.4 Hz, 2H), 7.90 (s, 2H), 8.25 (dd, J=1.6, 4.6 Hz, 2H), 8.67 (dd, J=1.4, 4.8 Hz, 2H), 9.07 (s, 1H) and 10.48 (s, 1H) ppm; MS (ES⁺) 292

Compound I-34: 3-amino-6-(6-morpholinopyridin-3-yl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 377

Compound I-35: 3-amino-N-(2-methoxyphenyl)-6-(thiophen-2-yl)pyrazine-2-carboxamide; MS (ES+) 327

Compound I-36: 3-amino-6-(1H-indazol-5-yl)-N-(2-methoxyphenyl)pyrazine-2-carboxamide; MS (ES+) 361

Compound I-37: 3-amino-6-(furan-3-yl)-N-(2-methoxyphenyl)pyrazine-2-carboxamide; MS (ES+) 311

Compound I-38: 3-amino-6-(2-methoxypyridin-4-yl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 322

Compound I-39: 3-amino-6-(1H-indazol-5-yl)-N-phenylpyrazine-2-carboxamide MS (ES⁺) 331

Compound I-40: 3-amino-N-phenyl-6-(pyrimidin-5-yl)pyrazine-2-carboxamide MS (ES⁺) 293

Compound I-41: 3-amino-6-(furan-2-yl)-N-phenylpyrazine-2-carboxamide MS (ES⁺) 281

Example 2: (R)-3-amino-N-phenyl-6-(4-(2-(pyrrolidin-1-ylmethyl)pyrrolidine-1-carbonyl)phenyl)pyrazine-2-carboxamide (Compound I-42)

Compound I-42 was prepared by using Method A, Steps 1-3 followed by Method I-B, Steps 1-2.

Method I-B Step 1: 3-(5-amino-6-(phenylcarbamoyl)pyrazin-2-yl)benzoic acid

A mixture of 3-amino-6-bromo-N-phenyl-pyrazine-2-carboxamide (2.5 g, 8.529 mmol), 3-boronobenzoic acid (1.415 g, 8.527 mmol) and Na₂CO₃ (1.808 g, 17.06 mmol) was suspended in MeCN (40 mL)/water (40 mL). The mixture was degassed (5×N₂ vacuum cycles) and Pd(PPh₃)₄(985.6 mg, 0.8529 mmol) added. The mixture was degassed again and heated to 90° C. After 2 hours, the mixture was allowed to cool and concentrated to half its original volume. The resulting yellow precipitate was collected and washed with DCM and water (3.05 g, 86% Yield). 1H NMR (400 MHz, DMSO) δ 7.16 (1H, t), 7.38-7.42 (3H, m), 7.64 (2H, br s), 7.81 (2H, d), 7.88 (1H, d), 8.17 (1H, d), 8.46 (1H, d), 8.85 (1H, s), 10.39 (1H, s) ppm; MS (ES⁺) 335

Step 2: (R)-3-amino-N-phenyl-6-(4-(2-(pyrrolidin-1-ylmethyl)pyrrolidine-1-carbonyl)phenyl)pyrazine-2-carboxamide

1-[[(2R)-pyrrolidin-2-yl]methyl]pyrrolidine (69.23 mg, 0.449 mmol) was weighed into a greenhouse tube and treated with a solution of 3-(5-amino-6-(phenylcarbamoyl)pyrazin-2-yl)benzoic acid (50 mg, 0.150 mmol), CDI (48.51 mg, 0.299 mmol) and DMAP (1.82 mg, 0.015 mmol) in DMSO (1 mL of a stock solution). DIPEA (78.2 uL, 0.449 mmol) was then added and the mixture stirred at 38° C. for 6 hours. The reaction mixture was filtered and the resultant residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 uM, 100 A column, gradient 10%-95% B (solvent A: 0.05% TFA in water, solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were freeze-dried to give the title compound as a solid (51.87 mg, 73% Yield). (ES⁺) 471

Compounds 1-42 to I-81 were prepared using Method A, Steps 1-3 followed by Method I-B, Steps 1-2.

Compound I-43: 6-(4-(1,4-diazepane-1-carbonyl)phenyl)-3-amino-N-phenylpyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) 1.44-1.47 (m, 1H), 1.53-1.58 (m, 1H), 2.57-2.61 (m, 1H), 2.62-2.69 (m, 2H), 2.74-2.80 (m, 1H), 3.15-3.20 (m, 2H), 3.40-3.46 (m, 2H), 6.91-6.96 (m, 1H), 7.15-7.19 (m, 2H), 7.23-7.28 (m, 2H), 7.51 (br s, 2H), 7.58-7.60 (m, 2H), 8.05-8.08 (m, 2H), 8.74 (s, 1H) and 10.20 (s, 1H) ppm; MS (ES⁺) 417

Compound I-44: 3-amino-6-(4-(3-methoxyazetidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide 1H NMR (400 MHz, DMSO) 3.22 (3H, s), 3.87 (1H, br dd), 4.18 (1H, br d), 4.23-4.29 (2H, br dd), 4.47-4.49 (1H, m), 7.17 (1H, t), 7.40 (2H, t), 7.75 (2H, d), 7.79 (2H, br s), 7.83 (2H, d), 8.29 (2H, d), 9.00 (1H, s), 10.44 (1H, s) ppm; MS (ES⁺) 404

Compound I-45: 3-amino-6-(4-((2-methoxyethyl)(methyl)carbamoyl)phenyl)-N-phenylpyrazine-2-carboxamide 1H NMR (400 MHz, DMSO) 3.00 (3H, br s), 3.45 (3H, br s), 3.61 (2H, br d), 7.17 (1H, t), 7.41 (2H, t), 7.49 (2H, d), 7.76 (2H, br s), 7.84 (2H, d), 8.29 (1H, d), 8.97 (1H, s), 10.44 (1H, s) ppm; MS (ES⁺) 406

Compound I-46: 3-amino-N-phenyl-6-(4-(2-(pyrrolidin-1-yl) ethylcarbamoyl)phenyl) pyrazine-2-carboxamide 1H NMR (400 MHz, DMSO) 1.80 (4H, br s), 3.51 (2H, br s), 7.18 (1H, t), 7.41 (2H, t), 7.81-7.85 (4H, m), 7.95 (2H, d), 8.35 (2H, d), 8.65 (1H, br s), 9.02 (1H, s), 10.44 (1H, s) ppm; MS (ES⁺) 431

Compound I-47: 3-amino-N-phenyl-6-(4-(tetrahydro-2H-pyran-4-ylcarbamoyl) phenyl)pyrazine-2-carboxamide 1H NMR (400 MHz, DMSO) 1.56-1.67 (2H, m), 1.75-1.80 (2H, m), 3.29-3.44 (2H, m), 3.88-3.92 (2H, m), 4.00-4.07 (1H, m), 7.15 (1H, t), 7.41 (2H, t), 7.79 (2H, br s), 7.82 (2H, d), 7.97 (2H, d), 8.33 (2H, d), 8.40 (1H, d), 9.01 (1H, s), 10.44 (1H, s) ppm; MS (ES⁺) 418

Compound I-48: 3-amino-6-(3-(1-methylpiperidin-4-ylcarbamoyl)phenyl)-N-phenylpyrazine-2-carboxamide 1H NMR (400 MHz, DMSO) 1.55-1.64 (2H, m), 1.76-1.81 (2H, m), 1.93 (2H, t), 2.16 (3H, s), 2.75 (2H, br d), 3.72-3.76 (1H, m), 7.12 (1H, t), 7.36 (2H, t), 7.54 (1H, t), 7.72 (2H, br s), 7.78-7.83 (3H, m), 8.37 (2H, dd), 8.55 (1H, s), 8.98 (1H, s), 10.44 (1H, s) ppm; MS (ES⁺) 431

Compound I-49: 3-amino-N-phenyl-6-(4-(2-(piperidin-1-yl) ethylcarbamoyl)phenyl) pyrazine-2-carboxamide 1H NMR (400 MHz, DMSO) 1.30-1.40 (2H, m), 1.46-1.53 (4H, m), 2.33 (4H, m), 2.45 (2H, t), 3.37-3.44 (2H, m), 7.16 (1H, t), 7.41 (2H, t), 7.79 (2H, br s), 7.81 (2H, d), 7.95 (2H. d), 8.34 (2H, d), 8.48 (1H, t), 9.00 (1H, s), 10.45 (1H, s) ppm; MS (ES⁺) 445

Compound I-50: 3-amino-6-(3-(4-(hydroxymethyl)piperidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide 1H NMR (400 MHz, DMSO) 1.10-1.22 (3H, m), 1.65 (2H, br s), 1.79 (1H, br d), 2.77 (1H, br t), 3.05 (1H, br t), 3.27 (2H, d), 3.64 (1H, br d), 4.52 (1H, br s), 7.17 (1H, t), 7.38-7.42 (3H, m), 7.55 (1H, t), 7.73 (2H, brs), 7.80 (2H, d), 8.19 (1H, s), 8.29 (1H, d), 8.96 (1H, s), 10.45 (1H, s) ppm; MS (ES⁺) 432

Compound I-51: 3-amino-6-(4-(cyclopropylcarbamoyl)phenyl)-N-phenylpyrazine-2-carboxamide 1H NMR (400 MHz, DMSO) 0.59-0.67 (2H, m), 0.69-0.74 (2H, m), 2.84-2.91 (1H, m), 7.17 (1H, t), 7.21 (2H, t), 7.79 (2H, br s), 7.81 (2H, d), 7.95 (2H, d), 8.39 (2H, d), 8.53 (1H, d), 8.97 1H, s), 10.46 (1H, s) ppm; MS (ES⁺) 374

Compound I-52: 3-amino-6-(3-((2-(dimethylamino)ethyl)(methyl)carbamoyl) phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 419

Compound I-53: 3-amino-N-phenyl-6-(3-(piperazine-1-carbonyl)phenyl) pyrazine-2-carboxamide; MS (ES+) 403

Compound I-54: 3-amino-N-phenyl-6-(3-(2-(pyrrolidin-1-yl)ethylcarbamoyl) phenyl)pyrazine-2-carboxamide; MS (ES+) 431

Compound I-55: 3-amino-6-(3-(3-(dimethylamino)pyrrolidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 431

Compound I-56: 3-amino-N-phenyl-6-(3-(4-(pyrrolidin-1-yl)piperidine-1-carbonyl) phenyl)pyrazine-2-carboxamide; MS (ES+) 471

Compound I-57: 3-amino-6-(3-(4-hydroxycyclohexylcarbamoyl)phenyl)-N-phenylpyrazine -2-carboxamide; MS (ES+) 432

Compound I-58: 3-amino-6-(3-(4-(2-cyanoethyl)piperazine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 456

Compound I-59: 3-amino-6-(3-(4-methylpiperazine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 417

Compound I-60: 3-amino-6-(3-(3-methoxyazetidine-1-carbonyl)phenyl)-N-phenylpyrazine -2-carboxamide; MS (ES+) 404

Compound I-61: 3-amino-N-phenyl-6-(3-(2-(piperidin-1-yl)ethylcarbamoyl)phenyl) pyrazine-2-carboxamide; MS (ES+) 445

Compound I-62: 3-amino-6-(3-(4-carbamoylpiperidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 445

Compound I-63: 3-amino-N-phenyl-6-(3-(pyrrolidine-1-carbonyl)phenyl)pyrazine-2-carboxamide; MS (ES+) 388

Compound I-64: 3-amino-6-(4-(1-methylpiperidin-4-ylcarbamoyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 431

Compound I-65: 3-amino-6-(3-(3-hydroxypyrrolidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 404

Compound I-66: 3-amino-N-phenyl-6-(3-(tetrahydro-2H-pyran-4-ylcarbamoyl)phenyl) pyrazine-2-carboxamide; MS (ES+) 418

Compound I-67: 3-amino-6-(3-((2-methoxyethyl)(methyl)carbamoyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 406

Compound I-68: 3-amino-6-(4-((2-(dimethylamino)ethyl)(methyl)carbamoyl) phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 419

Compound I-69: 3-amino-N-phenyl-6-(4-((tetrahydro-2H-pyran-4-yl)methylcarbamoyl) phenyl)pyrazine-2-carboxamide; MS (ES+) 432

Compound I-70: 3-amino-N-phenyl-6-(4-(pyrrolidine-1-carbonyl)phenyl)pyrazine-2-carboxamide; MS (ES+) 388

Compound I-71: 3-amino-N-phenyl-6-(4-(4-(pyrrolidin-1-yl)piperidine-1-carbonyl)phenyl) pyrazine-2-carboxamide; MS (ES+) 471

Compound I-72: 3-amino-6-(4-(azetidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 374

Compound I-73: 3-amino-6-(4-(4-methylpiperazine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 417

Compound I-74: 3-amino-N-phenyl-6-(4-(piperazine-1-carbonyl)phenyl)pyrazine-2-carboxamide; MS (ES+) 403

Compound I-75: 3-amino-6-(4-(3-hydroxypyrrolidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 404

Compound I-76: 3-amino-6-(4-(3-(dimethylamino)pyrrolidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 431

Compound I-77: 3-amino-6-(4-(4-carbamoylpiperidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 445

Compound I-78: 3-amino-N-phenyl-6-(4-(piperidine-1-carbonyl)phenyl)pyrazine-2-carboxamide; MS (ES+) 402

Compound I-79: 3-amino-6-(4-(4-(hydroxymethyl)piperidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 432

Compound I-80: 3-amino-6-(4-(4-(dimethylamino)piperidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 445

Compound I-81: 3-amino-6-(4-(4-(2-cyanoethyl)piperazine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; MS (ES+) 456

Example 3: 3-amino-6-(4-(methylsulfonyl)phenyl)-N-phenylpyrazine-2-carboxamide (Compound I-82)

Compound I-82 was prepared using Method A, Step 1 followed by Method I-C, Steps 1-3

Method I-C Step 1: Methyl 3-amino-6-(4-(methyl sulfonyl)phenyl)pyrazine-2-carboxylate

A mixture of methyl 3-amino-6-bromo-pyrazine-2-carboxylate (1.5 g, 6.465 mmol), (4-methylsulfonylphenyl)boronic acid (1.552 g, 7.758 mmol), bis(triphenylphosphine) palladium(II)dichloride (226.9 mg, 0.3233 mmol), and Na₂CO₃ (9.700 mL of 2 M, 19.40 mmol) in DME (18.75 mL) were heated in the microwave at 110° C. for 1 hour. The resultant mixture was diluted with EtOAc and washed with water. The organic phase was dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified on silica gel by flash column chromatography (50% EtOAc/hexanes) to afford the title compound (600 mg, 53% Yield).

1H NMR (400 MHz, DMSO) 3.25 (3H, s), 3.92 (3H, s), 7.61 (2H, br s), 8.00 (2H, m), 8.26 (2H, m), 9.03 (H, s) ppm; MS (ES⁺) 308 Step 2: 3-amino-6-(4-(methyl sulfonyl)phenyl)pyrazine-2-carboxylic acid

A mixture of methyl 3-amino-6-(4-(methylsulfonyl)phenyl)pyrazine-2-carboxylate (3.50 g, 11.39 mmol) and LiOH (1.364 g, 56.95 mmol) was dissolved in Methanol (14 mL) and water (14 ml) and allowed to heat at 90° C. for 2 hours. The reaction mixture was allowed to cool and neutralized with 1M HCl. The resultant precipitate was collected by filtration to afford the pure product as a yellow solid (3.32 g, 99% Yield). MS (ES⁺) 293

Step 3: 3-amino-6-(4-(methylsulfonyl)phenyl)-N-phenylpyrazine-2-carboxamide (Compound I-82)

A mixture of 3-amino-6-(4-methylsulfonylphenyl)pyrazine-2-carboxylic acid (1.5 g, 5.114 mmol), diethoxyphosphorylformonitrile (926.8 mg, 849.5 μL, 5.114 mmol), aniline (476.2 mg, 465.9 μL, 5.114 mmol) and triethylamine (1.035 g, 1.426 mL, 10.23 mmol) were stirred in DME (18.75 mL) at 120° C. for 18 hours. After this time water was added and the resultant solid collected by filtration. The solid was triturated with acetone and dried to give the desired product (1.335 g, 71% Yield). 1H NMR (400.0 MHz, DMSO) δ 3.28 (s, 3H), 7.18 (t, J=7.3 Hz, 1H), 7.41 (t, J=7.8 Hz, 2H), 7.82 (d, J=7.9 Hz, 2H), 7.89 (s, 2H), 8.01 (d, J=8.4 Hz, 2H), 8.51 (d, J=8.4 Hz, 2H), 9.04 (s, 1H) and 10.47 (s, 1H) ppm; MS (ES⁺) 369

Compounds 1-82 to 1-108 were all prepared using Method A, Step 1 followed by Method I-C, Steps 1-3.

Compound I-82: 3-amino-6-(4-(methylsulfonyl)phenyl)-N-phenylpyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 3.28 (s, 3H), 7.18 (t, J=7.4 Hz, 1H), 7.43-7.39 (m, 2H), 7.83-7.81 (m, 2H), 7.89 (s, 2H), 8.01 (dd, J=1.6, 7.0 Hz, 2H), 8.51 (d, J=8.5 Hz, 2H), 9.04 (s, 1H) and 10.46 (s, 1H) ppm; MS (ES⁺) 369.

Compound I-83: 3-amino-N-(1H-indol-7-yl)-6-(pyridin-3-yl)pyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 6.50 (dd, J=2.0, 2.9 Hz, 1H), 7.04 (t, J=7.7 Hz, 1H), 7.21 (d, J=7.4 Hz, 1H), 7.35 (t, J=2.8 Hz, 1H), 7.50 (d, J=7.8 Hz, 1H), 7.79 (dd, J=5.2, 8.0 Hz, 3H), 8.73 (dd, J=1.2, 5.2 Hz, 1H), 9.03 (d, J=8.2 Hz, 1H), 9.09 (s, 1H), 9.65 (d, J=1.9 Hz, 1H), 10.67 (s, 1H) and 11.00 (s, 1H) ppm; MS (ES⁺) 331

Compound I-84: 3-amino-N-(4-methoxyphenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 3.76 (s, 3H), 6.98 (dd, J=2.1, 6.9 Hz, 2H), 7.69 (dd, J=2.1, 6.9 Hz, 2H), 7.84 (dd, J=5.2, 8.1 Hz, 3H), 8.76 (dd, J=1.2, 5.2 Hz, 1H), 9.01-9.06 (m, 2H), 9.62 (d, J=1.9 Hz, 1H) and 10.46 (s, 1H) ppm; MS (ES⁺) 322

Compound I-85: 3-amino-N-phenyl-6-(pyridin-3-yl)pyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 7.17 (t, 1H), 7.49 (t, 2H), 7.68 (t, 1H), 7.82 (d, 2H), 7.87 (br s, 2H), 8.68 (d, 1H), 8.81 (d, 1H), 9.12 (s, 1H), 9.51 (s, 1H) and 10.48 (s, 1H) ppm; MS (ES⁺) 292

Compound I-86: 3-amino-N-(3-methoxyphenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide 1H NMR (400 MHz, DMSO) δ 3.79 (3H, s), 6.74 (1H, dd), 7.30 (1H, t), 7.44 (1H, d), 7.50-7.52 (2H, m), 7.8 (2H, br s), 8.59-8.62 (2H, m), 9.00 (1H, s), 9.44 (1H, s) and 10.42 (1H, s) ppm; MS (ES⁺) 322

Compound I-87: 3-amino-N-(3-cyanophenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 317

Compound I-88: 3-amino-N-(3-carbamoylphenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 335

Compound I-89: 3-amino-6-(pyridin-3-yl)-N-(pyrimidin-4-yl)pyrazine-2-carboxamide; MS (ES+) 294

Compound I-90: 3-amino-N-(3-(dimethylamino)phenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 335

Compound I-91: 3-amino-6-(pyridin-3-yl)-N-o-tolylpyrazine-2-carboxamide MS (ES⁺) 306

Compound I-92: 3-amino-N-(4-carbamoylphenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 335

Compound I-93: 3-amino-N-(4-ethanamidophenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 349

Compound I-94: 3-amino-N-(4-fluorophenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 310

Compound I-95: 3-amino-N-(3-ethanamidophenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 349

Compound I-96: 3-amino-N-(2-fluorophenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 310

Compound I-97: 3-amino-N-(pyridin-2-yl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 293

Compound I-98: 3-amino-6-(pyridin-3-yl)-N-(pyridin-4-yl)pyrazine-2-carboxamide; MS (ES+) 293

Compound I-99: 3-amino-N-(2,2-difluorobenzo[d][1,3]dioxol-4-yl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 372

Compound I-100: 3-amino-N-(5-ethanamido-2-methoxyphenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 379

Compound I-101: 3-amino-6-(pyridin-3-yl)-N-(3-sulfamoylphenyl)pyrazine-2-carboxamide; MS (ES+) 371

Compound I-102: 3-amino-6-(pyridin-3-yl)-N-(2-(trifluoromethoxy)phenyl)pyrazine-2-carboxamide; MS (ES+) 376

Compound I-103: 3-amino-N-(3-fluorophenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 310

Compound I-104: 3-amino-N-(1H-indol-5-yl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 331

Compound I-105: 3-amino-N-(1H-indol-6-yl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 331

Compound I-106: 3-amino-N-(2-methoxyphenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 322

Compound I-107: 3-amino-N-(2, 5-dimethoxyphenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 352

Compound I-108: 3-amino-N-(2-methoxy-5-methylphenyl)-6-(pyridin-3-yl)pyrazine-2-carboxamide; MS (ES+) 336

Example 4: 2-(3-amino-6-(4-(methylsulfonyl)phenyl)pyrazin-2-yl)-1H-benzo[d]imidazol-7-ol (Compound I-109)

Compound I-109 was prepared using Method A, Step 1 followed by Method I-C, Steps 1-2 followed by Method I-D, Step 1.

Method I-D Step 1: 2-(3-amino-6-(4-(methylsulfonyl)phenyl)pyrazin-2-yl)-1H-benzo[d]imidazol-7-ol

A mixture of 3-amino-6-(4-methylsulfonylphenyl)pyrazine-2-carboxylic acid (120 mg, 0.4091 mmol), diethoxyphosphorylformonitrile (73.40 mg, 0.4500 mmol), triethylamine (124.2 mg, 171.1 μL, 1.227 mmol) and 2,3-diaminophenol (50.79 mg, 0.4091 mmol) in DME (5 mL) was heated in the microwave at 170° C. for 1 hour. The mixture was diluted with EtOAc, washed with water and brine and concentrated in vacuo The residue was then dissolved in DCM and triturated with ether to give the desired product as a yellow solid (115 mg, 74% Yield). 1H NMR (400 MHz, DMSO) 3.6 (3H, s), 6.65 (1H, d), 7.1-7.18 (2H, m), 8.0-8.1 (4H, m), 8.6 (2H, d), 8.9 (1H, s), 9.05 (1H, br s), 9.9 (1H, s), 12.9 (1H, b rs) ppm; MS (ES⁺) 382

Compounds 1-109 to I-121 were prepared using Method A, Step 1 followed by Method I-C, Steps 1-2 followed by Method I-D, Step 1.

Compound I-110: 3-(1H-benzo[d]imidazol-2-yl)-5-phenylpyrazin-2-amine 1H NMR (400 MHz, CDCl₃) 1.5 (2H, br s), 7.35-7.7 (3H, m), 7.5-7.67 (3H, m), 7.87 (1H, d), 8.02 (1H, d), 8.62 (1H, s), 10.45 (1H, s) ppm; MS (ES⁺) 288

Compound I-111: 2-(3-amino-6-(4-(methylsulfonyl)phenyl)pyrazin-2-yl)-1H-benzo[d]imidazole-6-carbonitrile 1H NMR (400 MHz, DMSO) 3.3 (3H, s), 7.7-7.85 (2H, m), 8.05 (2H, d), 8.43 (1H, s), 8.55 (2H, d), 9.05 (1H, s), 13.55 (1H, br s) ppm; MS (ES⁺) 389

Compound I-112: 3-(3H-imidazo[4,5-b]pyridin-2-yl)-5-(4-(methylsulfonyl)phenyl) pyrazin-2-amine 1H NMR (400 MHz, CDCl₃) 3.05-3.1 (3H, m), 7.4-7.5 (2H, m), 7.95-8.05 (2H, m), 8.3-8.42 (3H, m), 8.8 (1H, m) ppm; MS (ES⁺) 367

Compound I-113: 2-(3-amino-6-phenylpyrazin-2-yl)-1H-benzo[d]imidazol-7-ol 1H NMR (400 MHz, DMSO) 6.63 (1H, d), 7.05-7.15 (2H, m), 7.4-7.44 (1H, m), 7.5-7.53 (3H, m), 8.3 (1H, d), 8.75 (2H, s), 9.95 (1H, s), 12.9 (1H, s) ppm; MS (ES⁺) 304

Compound I-114: 3-(6-chloro-1H-benzo[d]imidazol-2-yl)-5-(4-(methylsulfonyl)phenyl) pyrazin-2-amine 1H NMR (400 MHz, DMSO) 3.35 (3H, s), 7.25-7.35 (1H, m), 7.58-7.62 (1H, m), 7.75-7.85 (1H, m), 7.95-8.0 (2H, m), 8.45-8.52 (2H, m), 8.65-8.8 (1H, br s), 8.92-8.94 (1H, m), 13.2-13.26 (1H, m) ppm; MS (ES⁺) 400

Compound I-115: 3-(6-methoxy-1H-benzo[d]imidazol-2-yl)-5-(4-(methylsulfonyl)phenyl) pyrazin-2-amine 1H NMR (400 MHz, DMSO) 3.3 (3H, s), 3.85 (3H, s), 6.9-6.93 (1H, m), 7.1-7.3 (1H, m), 7.6-7.7 (1H, m), 8.05 (2H, d), 8.6 (2H, d), 8.95 (1H, s), 13.1 (1H, br s) ppm; MS (ES⁺) 396

Compound I-116: methyl 2-(3-amino-6-(4-(methylsulfonyl)phenyl)pyrazin-2-yl)-1H-benzo[d]imidazole-6-carboxylate 1H NMR (400 MHz, DMSO) 3.28-3.32 (3H, m), 3.9-3.95 (3H, m), 7.7-7.75 (1H, m), 7.9-7.92 (1H, m), 8.0-8.1 (3H, m), 8.3 (0.5H, s), 8.42 (0.5H, s), 8.52-8.6 (2H, m), 8.7 (1H, br s), 9.0-9.03 (1H, m), 13.4-13.48 (1H, m) ppm; MS (ES⁺) 424

Compound I-117: 3-(6-methyl-1H-benzo[d]imidazol-2-yl)-5-(4-(methylsulfonyl)phenyl) pyrazin-2-amine; 1H NMR (400 MHz, DMSO) 2.5 (3H, s), 3.35 (3H, s), 7.05-7.1 (1H, m), 7.4-7.7 (1H, m), 8.03 (2H, d), 8.57 (1H, d), 8.95 (1H, s), 12.95-13.05 (1H, m) ppm; MS (ES⁺) 380

Compound I-118: 5-(4-(methyl sulfonyl)phenyl)-3-(6-(trifluoromethyl)-1H-benzo[d]imidazol-2-yl)pyrazin-2-amine; 1H NMR (400 MHz, DMSO) 3.3 (3H, s), 3.85 (3H, s), 6.9-6.93 (1H, m), 7.1-7.3 (1H, m), 7.6-7.7 (1H, m), 8.05 (2H, d), 8.6 (2H, d), 8.95 (1H, s), 13.1 (1H, br s) ppm; MS (ES⁺) 434

Compound I-119: 3-(7-methyl-1H-benzo[d]imidazol-2-yl)-5-(4-(methylsulfonyl)phenyl) pyrazin-2-amine; 1H NMR (400 MHz, DMSO) 2.6-2.7 (3H, m), 3.3 (3H, s), 7.1-7.25 (2H, m), 7.47 (1H, d), 8.0-8.1 (3H, m), 8.6 (1H, d), 8.95 (1H, s), 9.05 (1H, br s), 12.7 (0.2H, br s), 13.1 (1H, br s) ppm; MS (ES⁺) 380

Compound I-120: 3-(3H-imidazo[4,5-c]pyridin-2-yl)-5-(4-(methyl sulfonyl)phenyl) pyrazin-2-amine; 1H NMR (400 MHz, DMSO) 3.13 (3H, s), 7.4-7.45 (1H, m), 7.5-7.6 (1H, m), 7.8-7.85 (2H, m), 8.2-8.25 (1H, m), 8.35-8.4 (2H, m), 8.7-8.75 (1H, m), 8.9 (1H, s), 13.25-13.35 (1H, m) ppm; MS (ES⁺) 367

Compound I-121: 3-(1H-benzo[d]imidazol-2-yl)-5-(pyridin-3-yl)pyrazin-2-amine 1H NMR (400 MHz, CDCl3) 7.25-7.35 (3H, m), 7.35-7.4 (1H, m), 7.52 (1H, d), 7.78 (1H, d), 8.17 (1H, d), 8.55 (1H, s), 8.59-8.62 (1H, m), 9.17-9.19 (1H, m) ppm; MS (ES⁺) 289

Example 5: 3-(1H-benzo[d]imidazol-2-yl)-5-(3-(methylsulfonyl)phenyl)pyrazin-2-amine (Compound I-122)

Compound 122 was prepared using Method A, Steps 1-2 followed by Method I-E, Steps 1-2.

Method I-E Step 1: 3-(1H-benzo[d]imidazol-2-yl)-5-bromopyrazin-2-amine

A mixture of 3-amino-6-bromo-pyrazine-2-carboxylic acid (10 g, 45.87 mmol), benzene-1,2-diamine (5.45 g, 50.46 mmol), diethoxyphosphorylformonitrile (8.23 g, 50.46 mmol) and triethylamine (12.79 mL, 91.74 mmol) in DME (30 mL) was heated in the microwave at 170° C. for 40 minutes. The mixture was allowed to cool and water was added. The resultant dark-coloured precipitate was dissolved in EtOAc and stirred with charcoal for 30 minutes. After filtering through celite, the filtrate was concentrated in vacuo to give the product as a yellow solid (8.04 g, 60% Yield). 1H NMR (400 MHz, DMSO) 7.22-7.32 (2H, m), 7.55 (1H, d), 7.75 (1H, d), 7.8 (1h, br s), 8.8 (1H, br s), 13.1 (1H, s); MS (ES⁺) 291

Step 2: 3-(1H-benzo[d]imidazol-2-yl)-5-(3-(methylsulfonyl)phenyl)pyrazin-2-amine

A mixture of 3-(1H-benzimidazol-2-yl)-5-bromo-pyrazin-2-amine(50 mg, 0.1723 mmol), 3-methylsulfonylphenyl)boronic acid (34.46 mg, 0.1723 mmol), dichloropalladium; triphenylphosphane (6.047 mg, 0.008615 mmol) and disodium carbonate (258.5 μL of 2 M, 0.5169 mmol) in DME (625.0 μL) was heated in the microwave at 110° C. for 1 hour and then at 150° C. for 3 hours. The mixture was diluted with EtOAc and washed with water. The organic layer was separated, dried (MgSO₄) and concentrated in vacuo. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 uM, 100 A column, gradient 10%-95% B (solvent A: 0.05% TFA in water, solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were freeze-dried to give the title compound as a solid (37.7 mg, 60% Yield). 1H NMR (400 MHz, CDCl₃) 3.2 (3H, s), 7.3-7.45 (2H, m), 7.65 (1H, d), 7.75 (1H, t), 7.85 (1H, d), 8.0 (1H, d), 8.23 (1H, d), 8.65 (2H, s), 10.55 (1H, s); MS (ES⁺) 366

Compounds I-122 to I-137 were prepared was prepared using Method A, Steps 1-2 followed by Method I-E, Steps 1-2.

Compound I-123: 3-(1H-benzo[d]imidazol-2-yl)-5-(4-(methylsulfonyl) phenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) 3.4 (3H, s), 5.75 (2H, s), 7.2-7.38 (2H, m), 7.65 (1H, d), 7.8 (1H, d), 8.05 (1H, d), 8.55 (1H, d), 8.95 (2H, s), 13.3 (1H, s) ppm; MS (ES⁺) 366

Compound I-124: 4-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide 1H NMR (400 MHz, DMSO) δ 2.99 (s, 3H), 3.02 (s, 3H), 7.31 (dd, J=3.0, 6.0 Hz, 2H), 7.54 (d, J=8.4 Hz, 2H), 7.72 (s, 2H), 8.35 (d, J=8.4 Hz, 2H) and 8.86 (s, 1H) ppm; MS (ES⁺) 359

Compound I-125: (3-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)phenyl) (morpholino)methanone; MS (ES+) 401

Compound I-126: 3-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)phenol MS (ES⁺) 304

Compound I-127: (2-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)phenyl)methanol 1H NMR (400.0 MHz, DMSO) δ 4.72 (s, 2H), 7.27 (q, J=3.0 Hz, 2H), 7.38-7.47 (m, 2H), 7.55-7.67 (m, 5H) and 8.37 (s, 1H) ppm; MS (ES⁺) 318

Compound I-128: 4-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)-N-(3-hydroxypropyl)benzamide; MS (ES+) 389

Compound I-129: 4-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)benzonitrile; MS (ES+) 313

Compound I-130: N-(4-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl) benzyl) ethanamide; MS (ES+) 359

Compound I-131: (5-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)-2-fluorophenyl) (morpholino)methanone; MS (ES⁺) 419

Compound I-132: 4-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)-N-(2-hydroxyethyl)benzamide; MS (ES+) 375

Compound I-133: 4-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)-N-(2-(pyrrolidin-1-yl)ethyl)benzamide; MS (ES+) 428

Compound I-134: 3-(1H-benzo[d]imidazol-2-yl)-5-(4-(pyrrolidin-1-ylsulfonyl)phenyl) pyrazin-2-amine; MS (ES+) 421

Compound I-135: 3-(1H-benzo[d]imidazol-2-yl)-5-(6-morpholinopyridin-3-yl)pyrazin-2-amine; 1H NMR (400.0 MHz, DMSO) δ 3.57-3.59 (m, 4H), 3.75-3.77 (m, 4H), 7.07 (d, J=9.1 Hz, 1H), 7.28-7.32 (m, 2H), 7.71 (s, 2H), 8.53 (d, J=8.2 Hz, 1H), 8.77 (s, 1H) and 9.03 (d, J=2.0 Hz, 1H) ppm; MS (ES⁺) 374

Compound I-136: 3-(1H-benzo[d]imidazol-2-yl)-5-(2-(piperazin-1-yl)pyridin-4-yl)pyrazin-2-amine; MS (ES+) 373

Compound I-137: 5-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)pyridin-2-ol; MS (ES+) 305

Example 6: 3-(5-phenyl-4H-1,2,4-triazol-3-yl)-5-(pyridin-3-yl)pyrazin-2-amine (Compound I-138)

Compound 138 was prepared using Method A, Step 1 followed by Method I-F, Steps 1-4.

Method I-F Step 1: 3-amino-6-(pyridin-3-yl)pyrazine-2-carboxylic acid

A mixture of methyl 3-amino-6-bromo-pyrazine-2-carboxylate (8 g, 34.48 mmol), diethyl-(3-pyridyl)borane (6.084 g, 41.38 mmol), dichloropalladium; triphenylphosphane (1.210 g, 1.724 mmol) and disodium carbonate (51.70 mL of 2 M, 103.4 mmol) in DME (100 mL) were heated overnight at 80° C. The reaction mixture was cooled and EtOAc was added. The resultant precipitate was collected, treated with water and the resultant suspension heated and filtered hot. The solution was then allowed to cool and acidified with AcOH to approx pH 5. The precipitate was collected, washed with MeOH and dried to yield the product as a yellow powder (6.22 g, 83% Yield). 1H NMR (400.0 MHz, DMSO) δ 7.49 (dd, J=4.8, 7.4 Hz, 1H), 7.60 (s, 2H), 8.44 (d, J=7.6 Hz, 1H), 8.57 (d, J=3.7 Hz, 1H), 8.97 (s, 1H) and 9.27 (s, 1H) ppm; MS (ES⁺) 217

Step 2: Methyl 3-amino-6-(pyridin-3-yl)pyrazine-2-carboxylate

To 3-amino-6-(3-pyridyl)pyrazine-2-carboxylic acid (2 g, 9.251 mmol) in MeOH (50 mL) was added conc. H₂SO₄ (907.3 mg, 493.1 μL, 9.251 mmol) and the mixture heated to reflux for 2 hours. The solvent was removed in vacuo and the mixture neutralised with aq. Na₂CO₃. The resulting brown solid was collected by filtration and dried (2.08 g, 97% Yield). MS (ES⁺) 231

Step 3: 3-amino-6-(pyridin-3-yl)pyrazine-2-carbohydrazide

A mixture of methyl 3-amino-6-(3-pyridyl)pyrazine-2-carboxylate (2 g, 8.687 mmol) was heated in Hydrazine (1.392 g, 1.363 mL, 43.43 mmol) with a minimal amount of MeOH (5 mL) added at 80° C. for 2 hours. Water was added and the product collected by filtration, washed with methanol and dried to furnish the product as a brown solid (1.17 g, 58% Yield). 1H NMR (400.0 MHz, DMSO) δ 4.52 (br s, 2H), 7.43 (m, 1H), 7.71 (s, 2H), 8.54 (2H, m), 8.90 (1H, s), 9.39 (1H, s), 10.16 (1H, s) ppm; MS (ES⁺) 231

Step 4: 3-(5-phenyl-4H-1,2,4-triazol-3-yl)-5-(pyridin-3-yl)pyrazin-2-amine (Compound 138)

A mixture of 3-amino-6-(3-pyridyl)pyrazine-2-carbohydrazide (40 mg, 0.173 mmol), benzamidine hydrochloride (27.2 mg, 0.173 mmol) and sodium ethanolate (11.82 mg, 0.173 mmol) were added to a 5 mL microwave vial in DMF (1 mL). The reaction mixture was heated in the microwave at 200° C. for 20 min. The mixture was concentrated in vacuo and the residue purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 uM, 100 A column, gradient 10%-95% B (solvent A: 0.05% TFA in water, solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were freeze-dried to give the title compound as a solid (12.5 mg, 20% Yield). 1H NMR (500 MHz, DMSO) δ 7.5 (m, 3H), 7.66 (m, 1H), 7.94 (br s, 2H), 8.16 (m, 2H), 8.66 (s, 1H), 8.79 (br s, 1H), 8.96 (s, 1H), 9.52 (s, 1H) and 14.94 (s, 1H) ppm; MS (ES⁺) 316

Compounds I-138 to I-143 were prepared using Method A, Step 1 followed by Method I-F, Steps 1-4

Compound I-139: 3-(5-(4-(aminomethyl)phenyl)-4H-1,2,4-triazol-3-yl)-5-(pyridin-3-yl)pyrazin-2-amine; MS (ES+) 345

Compound I-140: 3-(5-(3-aminophenyl)-4H-1,2,4-triazol-3-yl)-5-(pyridin-3-yl)pyrazin-2-amine; 1H NMR (400.0 MHz, DMSO) δ 6.98-7.03 (m, 1H), 7.39 (t, J=7.8 Hz, 1H), 7.74 (s, 2H), 7.82 (dd, J=5.2, 8.1 Hz, 1H), 8.06 (s, 2H), 8.74 (dd, J=1.3, 5.2 Hz, 1H), 8.96 (d, J=7.9 Hz, 1H), 9.02 (s, 1H), 9.60 (s, 1H) and 15.03 (br s, 1H) ppm; MS (ES⁺) 331

Compound I-141: 5-(pyridin-3-yl)-3-(5-m-tolyl-4H-1,2,4-triazol-3-yl)pyrazin-2-amine; MS (ES⁺) 330

Compound I-142: 5-(pyridin-3-yl)-3-(5-(thiophen-2-yl)-4H-1,2,4-triazol-3-yl)pyrazin-2-amine; 1H NMR (400.0 MHz, DMSO) δ 7.22 (dd, J=3.8, 4.8 Hz, 1H), 7.68-7.73 (m, 2H), 7.81 (d, J=3.0 Hz, 1H), 7.95 (s, 2H), 8.69 (dd, J=1.2, 4.9 Hz, 1H), 8.84 (d, J=6.1 Hz, 1H), 8.99 (s, 1H), 9.55 (s, 1H) and 14.96 (s, 1H) ppm; MS (ES⁺) 322

Compound I-143: 3-(5-(3-(aminomethyl)phenyl)-4H-1,2,4-triazol-3-yl)-5-(pyridin-3-yl)pyrazin-2-amine; MS (ES+) 345

Example 7: 5-(4-(methylsulfonyl)phenyl)-3-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-amine (Compound I-144)

Method I-G Step 1: 3-amino-6-bromo-N′-hydroxypyrazine-2-carboximidamide

A solution of 3-amino-6-bromo-pyrazine-2-carbonitrile (1 g, 5.025 mmol) in MeOH (20 mL) was cooled to 0° C. and treated with hydroxylamine hydrochloride (349.2 mg, 5.025 mmol) and triethylamine (508.5 mg, 700.4 μL, 5.025 mmol) and the reaction allowed to warm to ambient temperature. After a period of 2 hours a precipitate was observed which was filtered off. The resultant filtrate was evaporated to dryness and triturated with MeOH to furnish further product as a beige solid (771 mg, 78% Yield).

1H NMR (400.0 MHz, DMSO) δ 5.88 (s, 2H), 7.64 (br s, 2H), 8.14 (s, 1H) and 10.38 (s, 1H) ppm; MS (ES⁺) 233

Step 2: 3-amino-N′-(benzoyloxy)-6-bromopyrazine-2-carboximidamide

3-amino-6-bromo-N′-hydroxypyrazine-2-carboximidamide (770 mg, 3.318 mmol) was suspended in DCM (10 mL) and triethylamine (369.3 mg, 508.7 μL, 3.650 mmol) followed by benzoyl chloride (513.1 mg, 423.7 μL, 3.650 mmol) were added. After 1 hour, the solvent was removed in vacuo and the residue triturated with MeOH. The resultant filtrate was filtered off to furnish the product as an off-white solid (779 mg, 70% Yield).

1H NMR (400.0 MHz, DMSO) δ 7.18 (br s, 2H), 7.55-7.59 (m, 2H), 7.69-7.73 (m, 1H), 7.89 (br s, 2H), 8.28-8.30 (m, 2H) and 8.32 (s, 1H) ppm; MS (ES⁺) 337

Step 3: 5-bromo-3-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-amine

A mixture of 3-amino-N′-(benzoyloxy)-6-bromopyrazine-2-carboximidamide (575 mg, 1.711 mmol) and polyphosphonic acid (2.300 mL) was heated at 70° C. for 3.5 hours. The resultant solution was diluted with water (20 mL), quenched with NaHCO₃ and the resultant product isolated by filtration (475 mg, 87% Yield) as a fawn solid.

1H NMR (400.0 MHz, DMSO) δ 7.48 (br s, 2H), 7.67-7.71 (m, 2H), 7.76-7.78 (m, 1H), 8.26-8.28 (m, 2H) and 8.43 (s, 1H) ppm; MS (ES⁺) 319

Step 4: 5-(4-(methylsulfonyl)phenyl)-3-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-amine (Compound 144)

A mixture of 5-bromo-3-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-amine (100 mg, 0.3143 mmol), (4-methylsulfonylphenyl)boronic acid (94.29 mg, 0.4714 mmol) and PdCl₂(PPh₃)₂(11.03 mg, 0.01572 mmol) in DMF (2 mL) was treated with Na₂CO₃ (471.4 μL of 2 M, 0.9429 mmol) and the reaction placed under an atmosphere of nitrogen and heated at 110° C. in a sealed tube for 16 hours. The resultant precipitate was filtered, washed with water and dried under vacuum (83 mg, 67% Yield).

1H NMR (400.0 MHz, DMSO) δ 3.27 (s, 3H), 7.58 (br s, 2H), 7.69-7.73 (m, 2H), 7.77-7.81 (m, 1H), 8.05 (d, J=8.5 Hz, 2H), 8.32 (dd, J=8.5, 18.0 Hz, 4H) and 9.04 (s, 1H) ppm; MS (ES⁺) 394

Compound IIA-1 was also prepared using Method I-G.

Compound IIA-1: 3-(5-phenyl-1,2,4-oxadiazol-3-yl)-5-(pyridin-3-yl)pyrazin-2-amine

1H NMR (400.0 MHz, DMSO) δ 7.32 (br s, 2H), 7.38 (dd, J=4.3, 8.0 Hz, 1H), 7.52-7.56 (m, 2H), 7.59-7.64 (m, 1H), 8.12-8.14 (m, 2H), 8.24-8.27 (m, 1H), 8.44 (dd, J=1.6, 4.8 Hz, 1H), 8.82 (s, 1H) and 9.11 (d, J=1.8 Hz, 1H) ppm; MS (ES⁺) 317

Example 8: 3-(benzo[d]thiazol-2-yl)-5-(4-(methylsulfonyl)phenyl)pyrazin-2-amine (Compound I-146)

Compound I-146 was prepared using Method A, Steps 1 followed by Method I-C, Steps 1-2 followed by Method I-H, Step 1.

Method I-H Step 1: 3-(benzo[d]thiazol-2-yl)-5-(4-(methylsulfonyl)phenyl)pyrazin-2-amine (Compound I-146)

3-amino-6-(4-methylsulfonylphenyl)pyrazine-2-carboxylic acid (350 mg, 1.193 mmol), was heated in thionyl chloride (4.258 g, 2.611 mL, 35.79 mmol) at 70° C. for 1 hour. The mixture was concentrated to dryness and washed several times with ether. The resultant acid chloride (150 mg, 0.458 mmol) was dissolved in acetonitrile, treated with 2-aminobenzothiol (172 mg, 1.374 mmol) and heated at 70° C. for 2 hours. The mixture was diluted with EtOAc and washed with sat. aq. Na₂CO₃, water and brine. The organic phase was dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified on silica gel by flash column chromatography (30-70% EtOAc/hexanes) to afford the title compound as a yellow solid after trituration with DCM/diethyl ether (102 mg, 52% Yield); 1H NMR (400 MHz, CDCl₃) 3.3 (3H, s), 7.65-7.8 (2H, m), 8.2 (1H, d), 8.25-8.3 (3H, m), 8.45 (2H, d), 8.8 (1H, br s), 8.85 (1H, s) ppm; MS (ES⁺) 383

Example 9: tert-butyl 4-(4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)phenylcarbonyl)-1,4-diazepane-1-carboxylate (Compound I-147)

Compound I-147 was prepared using Method A, Steps 1-2 followed by Method I-E, Step 1 followed by Method I, Steps 1-2.

Method I Step 1: 4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)benzoic acid

5-bromo-3-(6-methyl-1H-benzimidazol-2-yl)pyrazin-2-amine (1.855 g, 6.099 mmol), 4-boronobenzoic acid (1.012 g, 6.099 mmol) and Na₂CO₃ (1.293 g, 12.20 mmol) suspended in MeCN (30 mL)/water (30 mL). The mixture was degassed (5×N₂ vacuum cycles) and Pd(PPh₃)₄(704.8 mg, 0.6099 mmol) added. The mixture was degassed again and heated to 90° C. No sign of product was observed therefore 25 mL aliquots were heated in the microwave for 1 hour at 140° C. which led to product formation. The mixture was allowed to cool and washed with DCM (×2). The aqueous layer was acidified to pH4 (1M HCl) and the resulting precipitate collected, washed with water and dried overnight under vacuum to give the product as a bright yellow solid, (1.30 g, 62% Yield); MS (ES⁺) 346

Step 2: tert-butyl 4-(4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)phenylcarbonyl)-1,4-diazepane-1-carboxylate

To a solution of 4-[5-amino-6-(6-methyl-1H-benzimidazol-2-yl)pyrazin-2-yl]benzoic acid (108 mg, 0.3127 mmol) in DMSO (1 mL) were added tert-butyl 1,4-diazepane-1-carboxylate (187.9 mg, 0.9381 mmol), diethylcyanophosphonate (124.7 mg, 114.3 μL, 0.6879 mmol) and DIPEA (121.2 mg, 163.3 μL, 0.9381 mmol). The reaction mixture was heated at 80° C. overnight, allowed to cool and filtered and the resultant taken on to the next step without further purification (122 mg, 75% Yield).

1H NMR (400.0 MHz, DMSO) δ 1.43 (s, 9H), 1.59 (s, 1H), 1.79 (s, 1H), 2.47 (s, 3H), 3.39-3.73 (m, 8H), 5.80 (br s, 2H), 7.13 (m, 1H), 7.44-7.49 (m, 3H), 7.61 (d, 1H), 8.32-8.37 (m, 3H) and 8.85 (s, 1H) ppm; MS (ES⁺) 528

Compounds 1-147 to 1-152 were all prepared using Method A, Steps 1-2 followed by Method I-E, Step 1 followed by Method I, Steps 1-2.

Compound 148: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl) phenyl)(4-(dimethylamino)piperidin-1-yl)methanone 1H NMR (400.0 MHz, DMSO) δ 12.9 (2H, d), 9.78 (1H, s), 8.86 (1H, s), 8.37 (2H, d), 8.24 (1H, br s), 7.61 (1H, d), 7.54 (2H, d), 7.49 (1H, s), 7.13 (1H, d), 4.05-5.00 (4H, m), 3.79 (1H, m), 3.47 (1H, m), 3.14 (1H, m), 2.79 (3H, s), 2.77 (3H, s), 2.47 (3H, s), 2.02 (2H, m), 1.63 (2H, m) ppm; MS (ES⁺) 456

Compound I-149: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl) phenyl)(piperazin-1-yl)methanone; MS (ES+) 414

Compound I-150: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl) phenyl)(4-methylpiperazin-1-yl)methanone 1H NMR (400.0 MHz, DMSO) δ 12.96 (1H, br s), 10.16 (1H, s), 8.87 (1H, s), 8.40 (2H, d), 7.61-7.57 (3H, m), 7.49 (1H, s), 7.12 (1H, d), 5.2-3.81 (2H, m), 3.49-3.11 (6H, m), 2.85 (3H, s), 2.47 (3H, s) ppm; MS (ES⁺) 428

Compound I-151: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl) phenyl)(4-methyl-1,4-diazepan-1-yl)methanone 1H NMR (400.0 MHz, CD₃OD) δ 8.56 (1H, s), 8.22 (2H, d), 7.55-7.46 (3H, m), 7.39 (1H, s), 7.05 (1H, d), 3.81-3.25 (10H, m), 2.90 (3H, s), 2.20 (3H, s), 2.21-2.07 (2H, m) ppm; MS (ES⁺) 442

Compound I-152: 4-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)-N-(2-(pyrrolidin-1-yl)ethyl)benzamide; MS (ES+) 428

Example 10: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)phenyl) (1,4-diazepan-1-yl)methanone (Compound I-153)

Method I-J Step 1: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)phenyl) (1,4-diazepan-1-yl)methanone

tert-butyl 4-[4-[5-amino-6-(6-methyl-1H-benzimidazol-2-yl)pyrazin-2-yl]benzoyl]-1,4-diazepane-1-carboxylate (117 mg, 0.2218 mmol) was dissolved in DCM (3 mL) and the mixture was cooled to 0° C. TFA (3 mL, 38.94 mmol) was added and the reaction mixture was allowed to warm to room temperature and stirred for a further 2 hours. Solvents were evaporated and the residue was dissolved in a mixture of MeCN and water (5 mL/5 mL) and submitted to Genevac evaporation to yield the product (119 mg, 99% Yield). 1H NMR (400.0 MHz, CD₃OD) δ 2.18-2.04 (2H, m), 2.45 (3H, s), 3.33 (3H, m), 3.44 (2H, m), 3.63 (2H, m), 3.82 (1H, m), 3.96 (2H, m), 7.15 (1H, d), 7.45 (1H, s), 7.55 (2H, d), 7.58 (1H, s), 8.59 (2H, d), 8.59 (1H, s) ppm; MS (ES⁺) 428

Example 11: 3-amino-6-(4-(4-(dimethylamino)piperidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide (Compound II-10)

Method II-A: Step 1: Methyl 3-amino-6-bromopyrazine-2-carboxylate

A mixture of methyl 3-aminopyrazine-2-carboxylate (8.35 g, 54.53 mmol) and N-bromo-succinimide (9.705 g, 54.53 mmol) was stirred in MeCN (100 mL) at room temp overnight. The resultant precipitate was filtered, washed with MeCN and dried to give the desired product as a yellow solid (11.68 g, 92% Yield); 1H NMR (400.0 MHz, DMSO) 3.85 (s, 3H), 7.55 (br s, 2H) and 8.42 (s, 1H) ppm; MS (ES⁺) 233

Step 2: 3-amino-6-bromopyrazine-2-carboxylic acid

A mixture of methyl 3-amino-6-bromo-pyrazine-2-carboxylate (5.11 g, 22.02 mmol) and lithium hydroxide (2.637 g, 110.1 mmol) in MeOH (20 mL) and H2O (20 mL) was heated to 90° C. for 2 hours. The reaction mixture was allowed to cool and neutralised with HCl and the resultant precipitate collected by filtration. Taken on to the next step without further purification (4.80 g, 99% Yield).

Step 3: 3-amino-6-bromo-N-phenylpyrazine-2-carboxamide

A mixture of 3-amino-6-bromo-pyrazine-2-carboxylic acid (3.5 g, 16.05 mmol), 1,1′-carbonyldiimidazole (5.205 g, 32.10 mmol), DIPEA (2.282 g, 3.075 mL, 17.66 mmol) and DMAP (98.04 mg, 0.8025 mmol) were combined in DMSO (131 mL) and stirred for 30 min. Aniline (1.495 g, 1.463 mL, 16.05 mmol) was then added and the resulting solution stirred at RT for 18 hours. After this time water was added and the product collected by filtration to give a brown powder (3.5 g, 74% Yield).

1H NMR (400.0 MHz, DMSO) δ 7.04 (1H, m), 7.29 (2H, m), 7.72 (4H, m), 8.36 (1H, s), 10.22 (NH₂) ppm; MS (ES⁺) 295.

Step 4: 4-(5-amino-6-(phenylcarbamoyl)pyrazin-2-yl)benzoic acid

A mixture of 3-amino-6-bromo-N-phenyl-pyrazine-2-carboxamide (3.62 g, 12.35 mmol), 4-boronobenzoic acid (2.049 g, 12.35 mmol) and Na₂CO₃ (2.618 g, 24.70 mmol) was suspended in MeCN (60 mL)/water (60 mL). The mixture was degassed (5×N₂ vacuum cycles) and Pd(PPh₃)₄(1.427 g, 1.235 mmol) added. The mixture was degassed again and heated to 90° C. After 4 hours, the mixture was allowed to cool, concentrated to half its original volume and washed with DCM. The aqueous phase was acidified to pH4 (2M HCl) and the resulting precipitate collected, washed with water and dried overnight under vacuum to give the product as a bright yellow solid, (3.05 g, 69% Yield). 1H NMR (400 MHz, DMSO) δ 7.17 (1H, t), 7.41 (2H, t), 7.83 (4H, d), 8.03 (2H, d), 8.37 (2H, d), 9.01 (1H, s), 10.45 (1H, s), 13.03 (1H, brs) ppm; MS (ES+) 335

Step 5: 3-amino-6-(4-(4-(dimethylamino)piperidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide

N,N-dimethylpiperidin-4-amine (57.54 mg, 0.449 mmol) was weighed into a greenhouse tube and treated with a solution of 4-(5-amino-6-(phenylcarbamoyl)pyrazin-2-yl)benzoic acid (50 mg, 0.150 mmol), CDI (48.51 mg, 0.299 mmol) and DMAP (1.82 mg, 0.015 mmol) in DMSO (1 mL of a stock solution). DIPEA (78.2 uL, 0.449 mmol) was then added and the mixture stirred at 38° C. for 6 hours. The reaction mixture was filtered and the resultant residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 uM, 100 A column, gradient 10%-95% B (solvent A: 0.05% TFA in water, solvent B: CH3CN) over 16 minutes at 25 mL/min]. The fractions were freeze-dried to give the title compound as a solid (54.65, 80% Yield). (ES⁺) 445

The following compounds were all prepared using the above sequence:

Compound II-1: 6-(4-(1,4-diazepane-1-carbonyl)phenyl)-3-amino-N-phenylpyrazine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 1.44-1.47 (m, 1H), 1.53-1.58 (m, 1H), 2.57-2.61 (m, 1H), 2.62-2.69 (m, 2H), 2.74-2.80 (m, 1H), 3.15-3.20 (m, 2H), 3.40-3.46 (m, 2H), 6.91-6.96 (m, 1H), 7.15-7.19 (m, 2H), 7.23-7.28 (m, 2H), 7.51 (br s, 2H), 7.58-7.60 (m, 2H), 8.05-8.08 (m, 2H), 8.74 (s, 1H) and 10.20 (s, 1H) ppm; (ES⁺) 417

Compound II-2: 3-amino-N-phenyl-6-(4-(2-(pyrrolidin-1-yl)ethylcarbamoyl)phenyl) pyrazine-2-carboxamide; 1H NMR (400 MHz, DMSO) δ 1.80 (4H, vbrs), 3.51 (2H, brs), 7.18 (1H, t), 7.41 (2H, t), 7.81-7.85 (4H, m), 7.95 (2H, d), 8.35 (2H, d), 8.65 (1H, brs), 9.02 (1H, s), 10.44 (1H, s) ppm; (ES⁺) 431

Compound II-3: 3-amino-N-phenyl-6-(4-(2-(piperidin-1-yl)ethylcarbamoyl) phenyl) pyrazine-2-carboxamide; 1H NMR (400 MHz, DMSO) δ 1.30-2.40 (2H, m), 1.46-1.53 (4H, m), 2.33 (4H, m), 2.45 (2H, t), 3.37-3.44 (2H, m), 7.16 (1H, t), 7.41 (2H, t), 7.79 (2H, brs), 7.81 (2H, d), 7.95 (2H. d), 8.34 (2H, d), 8.48 (1H, t), 9.00 (1H, s), 10.45 (1H, s) ppm; (ES⁺) 445

Compound II-4: 3-amino-N-phenyl-6-(4-(2-(pyrrolidin-1-ylmethyl)pyrrolidine-1-carbonyl)phenyl)pyrazine-2-carboxamide (ES⁺) 471

Compound II-5: 3-amino-6-(4-((2-(dimethylamino)ethyl)(methyl)carbamoyl) phenyl)-N-phenylpyrazine-2-carboxamide; (ES+) 419

Compound II-6: 3-amino-N-phenyl-6-(4-(4-(pyrrolidin-1-yl)piperidine-1-carbonyl)phenyl)pyrazine-2-carboxamide (ES⁺) 471

Compound II-7: 3-amino-6-(4-(4-methylpiperazine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; (ES+) 417

Compound II-8: 3-amino-N-phenyl-6-(4-(piperazine-1-carbonyl)phenyl)pyrazine-2-carboxamide; (ES+) 403

Compound II-9: 3-amino-6-(4-(3-(dimethylamino)pyrrolidine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; (ES+) 431

Compound II-11: 3-amino-6-(4-(4-(2-cyanoethyl)piperazine-1-carbonyl)phenyl)-N-phenylpyrazine-2-carboxamide; (ES+) 456

Example 12: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)phenyl) (1,4-diazepan-1-yl)methanone (Compound III-1)

Method III-A Step 1: Methyl 3-amino-6-bromopyrazine-2-carboxylate

A mixture of methyl 3-aminopyrazine-2-carboxylate (8.35 g, 54.53 mmol) and N-bromo-succinimide (9.705 g, 54.53 mmol) was stirred in MeCN (100 mL) at room temp overnight. The resultant precipitate was filtered, washed with MeCN and dried to give the desired product as a yellow solid (11.68 g, 92% Yield)

1H NMR (400.0 MHz, DMSO) 3.85 (s, 3H), 7.55 (br s, 2H) and 8.42 (s, 1H) ppm; MS (ES⁺) 233

Step 2: 3-amino-6-bromopyrazine-2-carboxylic acid

A mixture of methyl 3-amino-6-bromo-pyrazine-2-carboxylate (5.11 g, 22.02 mmol) and lithium hydroxide (2.637 g, 110.1 mmol) in MeOH (20 mL) and H2O (20 mL) was heated to 90° C. for 2 hours. The reaction mixture was allowed to cool and neutralised with HCl and the resultant precipitate collected by filtration. Taken on to the next step without further purification (4.80 g, 99% Yield).

Step 3: 5-bromo-3-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-amine

A mixture of 3-amino-6-bromo-pyrazine-2-carboxylic acid (5.52 g, 25.32 mmol), 4-methylbenzene-1,2-diamine (3.09 g, 25.32 mmol), diethoxyphosphorylformonitrile (4.54, 27.85 mmol) and triethylamine (7.06 mL, 50.64 mmol) in DME (30 mL) was heated in the microwave at 170° C. for 60 minutes. The mixture was diluted with Ethyl acetate, washed with water followed by aqueous NaHCO₃ then brine. After drying over MgSO₄, the mixture was decolourised with charcoal and filtered through silica gel. After concentration, the mixture was filtered to give gold coloured crystals (4.005 g, 52% Yield).

MS (ES⁺) 305

Step 4: 4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)benzoic acid

5-bromo-3-(6-methyl-1H-benzimidazol-2-yl)pyrazin-2-amine (1.855 g, 6.099 mmol), 4-boronobenzoic acid (1.012 g, 6.099 mmol) and Na₂CO₃ (1.293 g, 12.20 mmol) suspended in MeCN (30 mL)/water (30 mL). The mixture was degassed (5×N₂ vacuum cycles) and Pd(PPh₃)₄(704.8 mg, 0.6099 mmol) added. The mixture was degassed again and heated to 90° C. No sign of product was observed therefore 25 mL aliquots were heated in the microwave for 1 hour at 140° C. which led to product formation. The mixture was allowed to cool and washed with DCM (×2). The aqueous layer was acidified to pH4 (1M HCl) and the resulting precipitate collected, washed with water and dried overnight under vacuum to give the product as a bright yellow solid, (1.30 g, 62% Yield).

MS (ES+) 346

Step 5: tert-butyl 4-(4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)phenylcarbonyl)-1,4-diazepane-1-carboxylate

To a solution of 4-[5-amino-6-(6-methyl-1H-benzimidazol-2-yl)pyrazin-2-yl]benzoic acid (108 mg, 0.3127 mmol) in DMSO (1 mL) were added tert-butyl 1,4-diazepane-1-carboxylate (187.9 mg, 0.9381 mmol), diethylcyanophosphonate (124.7 mg, 114.3 μL, 0.6879 mmol) and DIPEA (121.2 mg, 163.3 μL, 0.9381 mmol). The reaction mixture was heated at 80° C. overnight, allowed to cool and filtered and the resultant taken on to the next step without further purification (122 mg, 75% Yield).

1H NMR (400.0 MHz, DMSO) δ 1.43 (s, 9H), 1.59 (s, 1H), 1.79 (s, 1H), 2.47 (s, 3H), 3.39-3.73 (m, 8H), 5.80 (br s, 2H), 7.13 (m, 1H), 7.44-7.49 (m, 3H), 7.61 (d, 1H), 8.32-8.37 (m, 3H) and 8.85 (s, 1H) ppm; MS (ES⁺) 528

Step 6: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)phenyl) (1,4-diazepan-1-yl)methanone (Compound III-1)

tert-butyl 4-[4-[5-amino-6-(6-methyl-1H-benzimidazol-2-yl)pyrazin-2-yl]benzoyl]-1,4-diazepane-1-carboxylate (117 mg, 0.2218 mmol) was dissolved in DCM (3 mL) and the mixture was cooled to 0° C. TFA (3 mL, 38.94 mmol) was added and the reaction mixture was allowed to warm to room temperature and stirred for a further 2 hours. Solvents were evaporated and the residue was dissolved in a mixture of MeCN and water (5 mL/5 mL) and submitted to Genevac evaporation to yield the product (119 mg, 99% Yield).

1H NMR (400.0 MHz, CD₃OD) δ 2.18-2.04 (2H, m), 2.45 (3H, s), 3.33 (3H, m), 3.44 (2H, m), 3.63 (2H, m), 3.82 (1H, m), 3.96 (2H, m), 7.15 (1H, d), 7.45 (1H, s), 7.55 (2H, d), 7.58 (1H, s), 8.59 (2H, d), 8.59 (1H, s) ppm; MS (ES⁺) 428

The following compounds were all prepared using the above sequence Step 1-5:

Compound III-2: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl) phenyl)(4-(dimethylamino)piperidin-1-yl)methanone

1H NMR (400.0 MHz, DMSO) δ 12.9 (2H, d), 9.78 (1H, s), 8.86 (1H, s), 8.37 (2H, d), 8.24 (1H, br s), 7.61 (1H, d), 7.54 (2H, d), 7.49 (1H, s), 7.13 (1H, d), 4.05-5.00 (4H, m), 3.79 (1H, m), 3.47 (1H, m), 3.14 (1H, m), 2.79 (3H, s), 2.77 (3H, s), 2.47 (3H, s), 2.02 (2H, m), 1.63 (2H, m) ppm; MS (ES⁺) 456

Compound III-3: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl) phenyl)(piperazin-1-yl)methanone; MS (ES+) 414

Compound III-4: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl) phenyl)(4-methylpiperazin-1-yl)methanone

1H NMR (400.0 MHz, DMSO) δ 12.96 (1H, br s), 10.16 (1H, s), 8.87 (1H, s), 8.40 (2H, d), 7.61-7.57 (3H, m), 7.49 (1H, s), 7.12 (1H, d), 5.2-3.81 (2H, m), 3.49-3.11 (6H, m), 2.85 (3H, s), 2.47 (3H, s) ppm; MS (ES⁺) 428

Compound III-5: (4-(5-amino-6-(6-methyl-1H-benzo[d]imidazol-2-yl)pyrazin-2-yl) phenyl)(4-methyl-1,4-diazepan-1-yl)methanone

1H NMR (400.0 MHz, CD₃OD) δ 8.56 (1H, s), 8.22 (2H, d), 7.55-7.46 (3H, m), 7.39 (1H, s), 7.05 (1H, d), 3.81-3.25 (10H, m), 2.90 (3H, s), 2.20 (3H, s), 2.21-2.07 (2H, m) ppm; MS (ES⁺) 442

Compound III-6: 4-(5-amino-6-(1H-benzo[d]imidazol-2-yl)pyrazin-2-yl)-N-(2-(pyrrolidin-1-yl)ethyl)benzamide: MS (ES⁺) 428

Example 1A: 4-(5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide (Compound IA-23)

Compound IA-23 was prepared using Method IV-A, Steps 1-3

Method IV-A Step 1: 3-amino-6-bromo-N-(phenylcarbonyl)pyrazine-2-carbohydrazide

TBTU (22.09 g, 68.80 mmol) and triethylamine (4.642 g, 6.394 mL, 45.87 mmol) were added to a suspension of 3-amino-6-bromo-pyrazine-2-carboxylic acid (10 g, 45.87 mmol) and benzohydrazide (7.494 g, 55.04 mmol) in DMF (100.0 mL) and the resulting solution stirred at ambient temperature for 48 hours and then poured into water (400 mL) with vigorous stirring. This was allowed to stir for 30 minutes, filtered and washed with water. The moist solid was dissolved in hot EtOAc, dried (MgSO₄), filtered and concentrated in vacuo and the resultant solid dried under vacuum to give the desired product (11.34 g, 73% Yield). 1H NMR (400.0 MHz, DMSO) δ 7.51 (2H, m), 7.61 (1H, m), 7.69 (2H, br s), 7.92 (2H, m), 8.44 (1H, s), 10.48 (1H, br s), 10.54 (1H, br s) ppm; MS (ES⁺) 338.01

Step 2: 5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

Polyphosphoric acid (314 g) was heated to 100° C. and treated portionwise with 3-amino-N′-benzoyl-6-bromopyrazine-2-carbohydrazide (22.5 g, 66.94 mmol) over a period of 20 minutes. The reaction was allowed to stir at 110-120° C. for 6 hours and then allowed to cool and treated with ice/water and stirred. The resultant solid was filtered and washed with water. It was taken into EtOAc, washed with water and adjusted to pH 11 (NaOH solution) and then washed with brine, dried (MgSO₄) and concentrated in vacuo to give the desired product (13.25 g, 62% Yield). 1H NMR (400.0 MHz, DMSO) δ 7.69 (3H, m), 7.86 (2H, br s), 8.16 (2H, m), 8.50 (1H, s) ppm; MS (ES⁺) 319.89

Step 3: 4-(5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide

5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (150 mg, 0.4715 mmol), [4-(dimethylcarbamoyl)phenyl]boronic acid (91.00 mg, 0.4715 mmol), sodium carbonate (99.95 mg, 0.9430 mmol) and palladium; triphenylphosphane (54.48 mg, 0.04715 mmol) in a mixture of acetonitrile (1.5 mL) and water (1.5 mL) was heated at 110° C. in the microwave for 30 minutes. The reaction was diluted with water and EtOAc and the layers separated. The combined organics were dried (MgSO₄), filtered and concentrated in vacuo. The residue was purified by column chromatography (ISCO Companion™, 12 g column, 0-100% EtOAc/Petroleum ether) to give the desired product (102.8 mg, 56% Yield). 1H NMR (400.0 MHz, DMSO) δ 2.98 (6H, m), 7.55 (2H, m), 7.69-7.71 (3H, m), 7.83 (2H, br s), 8.17-8.20 (4H, m), 9.00 (1H, s) ppm; MS (ES⁺) 387.13

The following compounds were all prepared using a method similar to the one described for Compound IA-23 above.

Compound IA-90: 5-(4-isopropylsulfinylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 0.95 (d, 3H), 1.25 (d, 3H), 2.98-3.02 (m, 1H), 7.6-8.0 (m, 6H), 8.25 (d, 2H), 8.35 (d, 2H) and 9.05 (s, 1H) ppm; MS (ES⁺) 406.2

Compound IA-112: 5-[4-(azetidin-1-ylsulfonyl)phenyl]-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, CDCl₃) δ 2.0-2.2 (m, 2H), 3.0-3.2 (m, 2H), 3.83-3.9 (m, 4H), 7.6-7.7 (m, 3H), 8.05 (d, 2H), 8.25-8.3 (m, 4H) and 8.85 (s, 1H) ppm; MS (ES⁺) 435.2

Compound IA-134: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-(2-phenylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 7.2-7.28 (2H, m), 7.3-7.35 (1H, m), 7.45-7.5 (1H, m), 7.55-7.6 (3H, m), 7.65-7.7 (3H, m), 7.75-7.8 (1H, m), 7.72 (1H, s) and 8.1-8.15 (2H, m) ppm; MS (ES⁺) 392.3

Compound IA-184: 5-(2-ethylsulfanylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, CDCl₃) δ 1.25 (t, 3H), 3.95 (q, 2H), 7.4-7.5 (m, 2H), 7.5-7.65 (m, 5H), 8.25 (d, 2H) and 8.6 (s, 1H) ppm; MS (ES⁺) 376.2

Compound IA-207: 5-(2-oxazol-5-ylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 7.6-7.8 (m, 9H), 8.1-8.13 (m, 2H), 8.15 (s, 1H) and 8.18 (s, 1H) ppm; MS (ES⁺) 383.1

Compound IA-229: 5-(2-isopropylsulfanylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, CDCl₃) δ 1.35 (d, 6H), 3.4-3.5 (m, 1H), 7.0 (br s, 2H), 7.4-7.45 (m, 2H), 7.5-7.65 (m, 5H), 8.2-8.25 (m, 2H) and 8.55 (s, 1H) ppm; MS (ES⁺) 390.2

Example 2A: 4-(5-amino-6-(5-(3-fluorophenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide (Compound IA-40)

Compound IA-40 was prepared using Method IV-B, Steps 1-4

Method IV-B Step 1: Methyl 3-amino-6-(4-(dimethylcarbamoyl)phenyl)pyrazine-2-carboxylate

Methyl 3-amino-6-bromo-pyrazine-2-carboxylate (625.1 mg, 2.694 mmol), [4-(dimethylcarbamoyl)phenyl]boronic acid (520 mg, 2.694 mmol), sodium carbonate (571.1 mg, 5.388 mmol) and palladium; triphenylphosphane (311.3 mg, 0.2694 mmol) in a mixture of acetonitrile (3 mL) and water (3 mL) was heated at 110° C. in the microwave for 30 minutes. The reaction was diluted with EtOAc and water and the layers separated. The aqueous later was extracted further with EtOAc (2×) and the combined organics dried (MgSO₄), filtered and concentrated in vacuo. The residue was purified by column chromatography (ISCO Companion™, 40 g column, 0-100% EtOAc/Petroleum ether) to give the desired product as a yellow solid (375 mg, 46% Yield). 1H NMR (400.0 MHz, DMSO) δ 3.02 (3H, s), 3.15 (3H, s), 4.04 (3H, s), 7.54 (2H, m), 7.97 (2H, m), 8.71 (1H, s) ppm; MS (ES⁺) 301.13

Step 2: 3-amino-6-(4-(dimethylcarbamoyl)phenyl)pyrazine-2-carboxylic acid

To a solution of methyl 3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazine-2-carboxylate (390 mg, 1.299 mmol) in MeOH (2.127 mL) was added a solution of NaOH (649.5 μL of 2 M, 1.299 mmol) in H₂O (2.127 mL). The resulting solution was heated to 60° C. for 2 hours and then allowed to cool and neutralised with HCl. The resultant precipitate was collected and washed with ether and dried (340 mg, 91% Yield). MS (ES⁺) 287.08

Step 3: 4-(5-amino-6-(2-(3-fluorophenylcarbonyl)hydrazinecarbonyl)pyrazin-2-yl)-N,N-dimethylbenzamide

3-fluorobenzohydrazide (80.77 mg, 0.5240 mmol) was added to a solution of 3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazine-2-carboxylic acid (150 mg, 0.5240 mmol), triethylamine (53.02 mg, 73.03 μL, 0.5240 mmol) and TBTU (252.4 mg, 0.7860 mmol) in DMF (3.000 mL) and the resulting solution stirred at RT for 2 hours. The reaction was diluted with EtOAc and water and the layers separated. The aqueous layer was extracted further with EtOAc (2×) and the combined organics washed with water (3×), dried (MgSO₄), filtered and concentrated to give the desired product as a yellow solid (172 mg, 78% Yield). MS (ES⁺) 423.13

Step 4: 4-(5-amino-6-(5-(3-fluorophenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide

A suspension of 4-[5-amino-6-[[(3-fluorobenzoyl)amino]carbamoyl]pyrazin-2-yl]-N,N-dimethyl-benzamide (127 mg, 0.3007 mmol) in anhydrous acetonitrile (2.540 mL) cooled in an ice bath, was treated with DIPEA (116.6 mg, 157.1 μL, 0.9021 mmol) followed by dibromo(triphenyl)phosphorane (165.0 mg, 0.3909 mmol) portionwise. The reaction mixture was then placed under nitrogen and allowed to stir for 10 minutes. The resultant precipitate was isolated by filtration, washed with ether and dried to give the impure desired product. The material was purified further by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were collected, passed through a sodium bicarbonate cartridge and freeze-dried to give the title compound as a yellow solid (58.4 mg, 48% Yield). 1H NMR (400.0 MHz, DMSO) δ 2.98 (6H, m), 7.55-7.61 (3H, m), 7.73-7.85 (3H, m), 7.96 (1H, m), 8.02 (1H, m), 8.19 (2H, m), 9.01 (1H, s) ppm; MS (ES⁺) 405.16

The following compounds were all prepared using a method similar to the one described for Compound IA-40 above.

Compound IA-195: 4-[5-amino-6-[5-(3-methoxyphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.98 (m, 6H), 3.90 (s, 3H), 7.28 (m, 1H), 7.55-7.57 (m, 2H), 7.60-7.65 (m, 2H), 7.74 (m, 1H), 8.17 (m, 2H) and 9.00 (1H, s) ppm; MS (ES⁺) 417.17

Compound IA-233: 4-[5-amino-6-[5-[2-(trifluoromethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.98 (m, 6H), 7.51 (m, 2H), 7.80 (br s, 1H), 7.93-8.01 (m, 2H), 8.09-8.14 (m, 3H), 8.19 (m, 1H) and 9.03 (s, 1H) ppm; MS (ES⁺) 455.12

Example 3A: 4-(5-amino-6-(5-(benzylamino)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide (Compound IA-55)

Compound IA-55 was prepared using Method IV-C, Steps 1-3

Method IV-C Step 1: Methyl 3-amino-6-(4-(dimethylcarbamoyl)phenyl)pyrazine-2-carboxylate

Methyl 3-amino-6-bromo-pyrazine-2-carboxylate (6.012 g, 25.91 mmol), [4-(dimethylcarbamoyl)phenyl]boronic acid (5 g, 25.91 mmol), sodium carbonate (5.492 g, 51.82 mmol) and Pd(PPh₃)₄(2.994 g, 2.591 mmol) in a mixture of acetonitrile (28.85 mL) and water (28.85 mL) was heated at 110° C. The reaction mixture was allowed to cool and the residual solid filtered off. The filtrate was diluted with EtOAc and water and the layers separated. The aqueous layer was acidified to pH4 (by addition of 1M HCl) and then extracted with dichloromethane (3×), dried (MgSO₄), filtered and concentrated in vacuo to leave the product as a yellow solid. The ethyl acetate extracts were concentrated in vacuo and combined with the filtered solid. Preabsorbed onto silica and purified by column chromatography on silica using the companion eluting with ethyl acetate/petroleum ether (0-100% EtOAc). Product eluted with 100% EtOAc. Product fractions combined and conc in vacuo to leave a yellow solid (1.95 g, 50% Yield). 1H NMR (400.0 MHz, DMSO) δ 3.02 (3H, s), 3.15 (3H, s), 4.04 (3H, s), 7.54 (2H, m), 7.97 (2H, m), 8.71 (1H, s) ppm; MS (ES⁺) 301.13

Step 2: 4-(5-amino-6-(hydrazinecarbonyl)pyrazin-2-yl)-N,N-dimethylbenzamide

To a stirred solution of methyl 3-amino-6-[4-(dimethylcarbamoyl) phenyl]pyrazine-2-carboxylate (1.7011 g, 5.664 mmol) in EtOH (10.21 mL) was added hydrazine (726.1 mg, 711.2 μL, 22.66 mmol). The resultant solution was heated to reflux for 30 minutes and then allowed to cool to RT. The precipitate was filtered off and dried (1.47 g, 87% Yield). 1H NMR (400.0 MHz, DMSO) δ 2.96 (s, 3H), 3.00 (s, 3H), 4.58 (d, J=4.4 Hz, 2H), 7.46 (d, J=8.4 Hz, 2H), 8.27-8.29 (m, 2H), 8.88 (s, 1H) and 10.09 (s, 1H) ppm; MS (ES⁺) 301.13

Step 3: 4-(5-amino-6-(5-(benzylamino)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide

A mixture of 4-(5-amino-6-(hydrazinecarbonyl)pyrazin-2-yl)-N,N-dimethylbenzamide (75 mg, 0.2497 mmol), isothiocyanatomethylbenzene (37.26 mg, 33.12 μL, 0.2497 mmol) and dry THF (1.500 mL) was stirred at RT for 4 hours. The reaction mixture was evaporated to dryness and treated with DCM followed by EDC (71.81 mg, 0.3746 mmol) and the resultant mixture allowed to stir at RT overnight. The reaction mixture was filtered and the resultant green precipitate dried under vacuum (78 mg, 73% Yield). 1H NMR (400.0 MHz, DMSO) δ 2.96 (s, 3H), 3.00 (s, 3H), 4.50 (d, J=6.1 Hz, 2H), 7.29 (d, J=7.2 Hz, 1H), 7.35-7.42 (m, 4H), 7.51-7.53 (m, 2H), 7.65 (br s, 2H), 8.06 (dd, J=1.5, 6.9 Hz, 2H) and 8.81 (d, J=12.4 Hz, 2H) ppm; MS (ES⁺) 416.2

The following compounds were all prepared using a method similar to the one described for Compound IA-55 above.

Compound IA-103: 4-[5-amino-6-[5-(2-methoxyanilino)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 3.03 (s, 3H), 3.07 (s, 3H), 3.94 (s, 3H), 7.07-7.10 (m, 1H), 7.15-7.17 (m, 2H), 7.59 (d, 2H), 7.75 (br s, 2H), 8.12-8.19 (m, 3H), 8.94 (s, 1H) and 10.17 (s, 1H) ppm; MS (ES⁺) 432.16

Compound IA-129: 4-[5-amino-6-[5-[[(1 S)-1-(4-chlorophenyl)ethyl]amino]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 1.50 (d, 3H), 2.96 (s, 3H), 3.01 (s, 3H), 4.83 (d, 1H), 7.40-7.47 (m, 4H), 7.51-7.54 (m, 4H), 8.06 (d, 2H), 8.81 (s, 1H) and 8.90 (br s, 1H) ppm; MS (ES⁺) 464.16

Compound IA-156: 4-[5-amino-6-[5-(phenethylamino)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.77 (s, 1H), 2.94 (t, 4H), 3.00 (s, 3H), 3.04 (s, 1H), 3.51-3.56 (m, 2H), 7.22-7.24 (m, 1H), 7.28-7.34 (m, 4H), 7.52 (d, 2H), 7.61 (s, 1H), 8.05-8.07 (m, 2H), 8.32 (t, 1H) and 8.81 (s, 1H) ppm; MS (ES⁺) 430.2

Compound IA-163: 4-[5-amino-6-[5-(cyclohexylamino)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 1.17-1.19 (m, 1H), 1.30-1.35 (m, 4H), 1.57-1.60 (m, 1H), 1.74-1.76 (m, 2H), 1.99 (s, 2H), 2.96 (s, 3H), 3.00 (s, 3H), 3.48 (br s, 1H), 7.52 (d, 2H), 7.62 (br s, 2H), 8.06 (d, 2H), 8.20 (d, 1H) and 8.81 (s, 1H) ppm; MS (ES⁺) 408.22

Compound IA-254: 4-[5-amino-6-[5-(3-cyanoanilino)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.97 (s, 3H), 3.01 (s, 3H), 7.54 (t, 3H), 7.63 (t, 1H), 7.75 (br s, 1H), 7.91 (dd, 2H), 8.09-8.13 (m, 3H), 8.91 (s, 1H) and 11.51 (s, 1H) ppm; MS (ES⁺) 427.15

Compound IA-278: 4-[6-(5-acetamido-1,3,4-oxadiazol-2-yl)-5-amino-pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.20 (s, 3H), 2.96 (s, 3H), 3.01 (s, 3H), 7.54 (d, 2H), 7.66 (br s, 2H), 8.08 (d, 2H), 8.92 (s, 1H) and 11.92 (s, 1H) ppm; MS (ES⁺) 368.13

Compound IA-287: 4-[5-amino-6-(5-benzamido-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.96 (s, 3H), 3.00 (s, 3H), 3.31 (s, 1H), 7.52-7.61 (m, 4H), 7.69 (t, 2H), 8.06-8.12 (m, 4H), 8.95 (s, 1H) and 12.35 (br s, 1H) ppm; MS (ES⁺) 430.14

Example 4A: (4-(5-amino-6-(5-phenyl-1,3,4-thiadiazol-2-yl)pyrazin-2-yl)phenyl)(1,4-diazepan-1-yl)methanone (Compound IA-68 or Compound IV-2)

Compound IA-68 was prepared using Method IV-D, Steps 1-2.

Method IV-D Step 1: 5-bromo-3-(5-phenyl-1,3,4-thiadiazol-2-yl)pyrazin-2-amine

3-amino-6-bromo-pyrazine-2-carboxylic acid (1.000 g, 4.588 mmol) and benzenecarbothiohydrazide (759.1 mg, 4.588 mmol) were suspended in acetonitrile (25.00 mL), cooled in an ice bath and then treated with dibromo-triphenyl-phosphorane (4.453 g, 10.55 mmol) The reaction mixture was allowed to stir in an ice bath for 2 hours and then DIPEA (1.778 g, 2.396 mL, 13.76 mmol) was added slowly at 10° C. The reaction was left to stir at 0-10° C. for a further hour and the resultant precipitate was isolated by filtration, washed with a small amount of acetonitrile and dried (659 mg, 43% Yield). MS (ES⁺) 335.93

Step 2: (4-(5-amino-6-(5-phenyl-1,3,4-thiadiazol-2-yl)pyrazin-2-yl)phenyl)(1,4-diazepan-1-yl)methanone

5-bromo-3-(5-phenyl-1,3,4-thiadiazol-2-yl)pyrazin-2-amine (70 mg, 0.1257 mmol) and [4-(4-tert-butoxycarbonyl-1,4-diazepane-1-carbonyl)phenyl]boronic acid (43.77 mg, 0.1257 mmol) (60% pure) were taken into dioxane (700.1 μL), treated with Na2CO3 (125.7 μL of 2 M, 0.2514 mmol) and degassed/nitrogen flushed (5×). The reaction was then treated with palladium; triphenylphosphane (14.53 mg, 0.01257 mmol), degassed again and heated in the microwave at 140° C. for 30 minutes. The reaction was treated with EtOAc and brine, the organics separated, dried over MgSO₄, filtered and concentrated under vacuum. The product was purified by column chromatography eluting 50% EtOAc/Petroleum ether followed by 10% MeOH/DCM to give the desired product which was dissolved in DCM (2.000 mL) and treating with TFA (2.960 g, 2.000 mL, 25.96 mmol). After stirring at RT for 30 minutes and concentration, the residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were collected, passed through a sodium bicarbonate cartridge and freeze-dried to give the title compound (42 mg, 74% Yield). 1H NMR (400.0 MHz, DMSO) δ 1.60 (1H, m), 1.77 (1H, m), 2.72-2.39 (4H, m_, 3.40 (2H, m), 3.60-3.67 (2H, m), 7.52 (2H, d), 7.58-7.65 (3H, m), 7.99 (1H, m), 8.00 (2H, br s), 8.10-8.14 (3H, m), 8.95 (1H, s); MS (ES⁺) 458.07

Example 5: 4-(5-amino-6-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-yl)phenyl)(1,4-diazepan-1-yl)methanone (Compound IA-2)

Compound IA-2 was prepared using Method IV-E, Steps 1-5.

Method IV-E Step 1: 3-amino-6-bromo-N-hydroxypyrazine-2-carboximidamide

A mixture of 3-amino-6-bromo-pyrazine-2-carbonitrile (1 g, 5.025 mmol) was dissolved in MeOH (20.00 mL) and cooled to 0° C. Hydroxylamine hydrochloride (349.2 mg, 5.025 mmol) and triethylamine (508.5 mg, 700.4 μL, 5.025 mmol) were added and the reaction allowed to warm to ambient temperature. After 2 hours the resultant precipitate was filtered off and dried (898 mg, 77% Yield). MS (ES⁺) 234.89

Step 2: 3-amino-6-bromo-N′-(phenylcarbonyloxy)pyrazine-2-carboximidamide

3-amino-6-bromo-N′-hydroxypyrazine-2-carboximidamide (890 mg, 3.836 mmol) was suspended in dichloromethane (11.56 mL) and treated with triethylamine (427.0 mg, 588.2 μL, 4.220 mmol) followed by benzoyl chloride (593.2 mg, 489.8 μL, 4.220 mmol) The reaction mixture was allowed to stir for 1 hour and concentrated in vacuo. The resultant residue was triturated with methanol to give the desired product as a pale beige solid (891 mg, 69% Yield). 1H NMR (400.0 MHz, DMSO) δ 7.55 (2H, m), 7.65 (1H, m), 7.90 (2H, br s), 8.28 (2H, m), 8.33 (1H, s); MS (ES⁺) 337.87

Step 3: 5-bromo-3-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-amine

3-amino-N′-(benzoyloxy)-6-bromopyrazine-2-carboximidamide (890 mg, 2.648 mmol) and polyphosphonic acid (3.560 mL) were mixed and the reaction heated to 70° C. Further polyphosphonic acid (8.900 mL) was added and the reaction allowed to stir for a further 3 hours at 70° C. The mixture was then allowed to cool to RT, diluted with water and neutralised by the portionwise addition of solid NaHCO₃. The resulting precipitate was isolated by filtration and dried (643 mg, 76% Yield). 1H NMR (400.0 MHz, DMSO) δ 7.49 (2H, br s), 7.69 (2H, m), 7.77 (1H, m), 8.28 (2H, m), 8.43 (1H, s); MS (ES⁺) 319.89

Step 4: 4-(5-amino-6-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-yl)benzoic acid

5-bromo-3-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-amine (200 mg, 0.6287 mmol) 4-carboxyphenylboronic acid (104.3 mg, 0.6287 mmol) and Na₂CO₃ (133.2 mg, 1.257 mmol) were suspended in MeCN (3.314 mL)/water (3.314 mL) and the mixture de-gassed (×5) and treated with Pd(PPh₃)₄(72.65 mg, 0.06287 mmol). The reaction was de-gassed again and heated at 110° C. in the microwave for 30 minutes. The mixture was concentrated to half its original volume and washed with DCM. The aqueous phase was acidified to pH4 (2M HCl) and resulting precipitate collected, washed with water and dried under vacuum (172 mg, 76% Yield). 1H NMR (400.0 MHz, DMSO) δ 7.41 (2H, br s), 7.69 (2H, m), 7.76 (1H, m), 7.98 (2H, m), 8.09 (2H, m), 8.29 (2H, m), 8.94 (1H, s); MS (ES⁺) 360.98

Step 5: 4-(5-amino-6-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-yl)phenyl)(1,4-diazepan-1-yl)methanone

A solution of 4-[5-amino-6-(5-phenyl-1,2,4-oxadiazol-3-yl)pyrazin-2-yl]benzoic acid (80 mg, 0.2226 mmol), CDI (72.19 mg, 0.4452 mmol), DIPEA (86.31 mg, 116.3 μL, 0.6678 mmol), DMAP (2.719 mg, 0.02226 mmol) in DMSO (1.370 mL) was treated with 1,4-diazepane (66.89 mg, 0.6678 mmol) and the resulting solution stirred at RT overnight. An additional equivalent of 1,4-diazepane (22.30 mg, 0.2226 mmol) was added and the reaction mixture allowed to stir for a further night. The reaction mixture was treated with water and the aqueous layer extracted with EtOAc. The layers were separated and the organics dried (MgSO₄), concentrated in vacuo and purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were collected and freeze-dried to give the title compound as a yellow solid (58.1 mg, 39% Yield). 1H NMR (400.0 MHz, DMSO) δ 1.96-2.04 (2H, m), 3.25-3.85 (8H, m—with water signal), 7.47 (2H, br s), 7.60 (2H, m), 7.71 (2H, m), 7.79 (1H, m), 8.16 (2H, m), 8.29 (2H, m), 8.77 (2H, m), 8.97 (1H, s); MS (ES⁺) 442.02

Example 6A: 4-(5-amino-6-(3-phenylisoxazol-5-yl)pyrazin-2-yl)phenyl)(1,4-diazepan-1-yl)methanone (Compound IIA-3)

Compound IIA-3 was prepared using Method IV-F, Steps 1-6.

Method IV-F Step 1: 5-bromo-3-((trimethylsilyl)ethynyl)pyrazin-2-amine

(Trimethylsilyl)acetylene (1.845 g, 2.655 mL, 18.78 mmol) was added dropwise to a solution of 3,5-dibromopyrazin-2-amine (5 g, 19.77 mmol), triethylamine (10.00 g, 13.77 mL, 98.85 mmol), Copper(I) iodide (451.7 mg, 2.372 mmol) and Pd(PPh₃)₄(1.142 g, 0.9885 mmol) in DMF (25.00 mL) and the resulting solution stirred at RT for 30 minutes. The reaction mixture was diluted with EtOAc and water and the layers separated. The aqueous layer was extracted further with EtOAc and the combined organics washed with water, dried (MgSO₄) and concentrated in vacuo. The residue was purified by column chromatography eluting with 15% EtOAc/Petroleum ether to give the product as a yellow solid (3.99 g, 75% Yield). 1H NMR (400.0 MHz, DMSO) δ 0.30 (9H, s), 8.06 (1H, s); MS (ES⁺) 271.82

Step 2: tert-butyl N-tert-butoxycarbonyl-N-[5-bromo-3-((trimethylsilyl)ethynyl) pyrazin-2-yl]carbamate

5-bromo-3-(2-trimethylsilylethynyl)pyrazin-2-amine (2.85 g, 10.55 mmol) was dissolved in DCM (89.06 mL) and treated with BOC anhydride (6.908 g, 7.272 mL, 31.65 mmol) followed by DMAP (128.9 mg, 1.055 mmol). The reaction was allowed to stir at ambient temperature for 2 hours and then diluted with DCM and NaHCO₃ and the layers separated. The aqueous layer was extracted further with DCM, dried (MgSO₄), filtered and concentrated in vacuo. The resultant residue was purified by column chromatography eluting with dichloromethane to give the desired product as a colourless oil (4.95 g, 99% Yield). 1H NMR (400.0 MHz, DMSO) δ 0.27 (9H, s), 1.42 (18H, s), 8.50 (1H, s); MS (ES⁺) 472.09

Step 3: tert-butyl N-(5-bromo-3-ethynyl-pyrazin-2-yl)-N-tert-butoxycarbonyl-carbamate

Sodium carbonate (918.5 μL of 2 M, 1.837 mmol) was added to a solution of tert-butyl N-[5-bromo-3-(2-trimethylsilylethynyl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (720 mg, 1.531 mmol) in DMF (2 mL) and the resulting solution heated at 90° C. for 20 minutes. The reaction mixture was allowed to cool to RT and diluted with EtOAc and water and the layers separated. The aqueous layer was extracted further with EtOAc and the combined organics washed with water, dried (MgSO₄) and concentrated in vacuo to give the product as a yellow solid (574 mg, 94% Yield). 1H NMR (400.0 MHz, DMSO) δ 1.43 (18H, s), 3.53 (1H, s), 8.55 (1H, s); MS (ES⁺) 400.03

Step 4: tert-butyl N-[5-bromo-3-(3-phenylisoxazol-5-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate

Triethylamine (50.82 mg, 70.00 μL, 0.5022 mmol) was added to a solution of tert-butyl N-(5-bromo-3-ethynyl-pyrazin-2-yl)-N-tert-butoxycarbonyl-carbamate (200 mg, 0.5022 mmol) and N-hydroxybenzimidoyl chloride (78.13 mg, 0.5022 mmol) in THF (16.00 mL) and the reaction mixture stirred at RT for 1 hour. After this time the reaction mixture was heated under reflux for 3 hours, cooled to RT and concentrated in vacuo. The residue was purified by column chromatography eluting with 10% EtOAc/Petroleum ether to give the product as a colourless oil that crystallised on standing (182 mg, 70% Yield). 1H NMR (400.0 MHz, DMSO) δ 1.41 (18H, s), 7.37 (1H, s), 7.52 (3H, m), 7.90 (2H, m), 8.68 (1H, s); MS (ES⁺) 519.05

Step 5: 4-(5-(bis(tert-butoxycarbonyl)amino)-6-(3-phenylisoxazol-5-yl)pyrazin-2-yl)benzoic acid

Tert-butyl N-[5-bromo-3-(3-phenylisoxazol-5-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (184 mg, 0.3379 mmol), 4-boronobenzoic acid (56.07 mg, 0.3379 mmol) and Na₂CO₃ (71.63 mg, 0.6758 mmol) were suspended in MeCN (2.896 mL)/water (2.896 mL) and the mixture de-gassed (×5) and treated with Pd(PPh₃)₄(39.05 mg, 0.03379 mmol). The reaction was de-gassed again and heated at 110° C. in the microwave for 30 minutes. The reaction mixture was concentrated to half its original volume and washed with DCM. The aqueous phase was acidified to pH4 by (2M HCl) and resulting precipitate collected, washed with water and dried under vacuum (120 mg, 99% Yield). MS (ES⁺) 359.12

Step 6: 4-(5-amino-6-(3-phenylisoxazol-5-yl)pyrazin-2-yl)phenyl)(1,4-diazepan-1-yl)methanone

To a solution of 4-[5-amino-6-(3-phenylisoxazol-5-yl)pyrazin-2-yl]benzoic acid (120 mg, 0.3349 mmol), CDI (108.6 mg, 0.6698 mmol), DIPEA (129.9 mg, 175.1 μL, 1.005 mmol), DMAP (4.091 mg, 0.03349 mmol) in DMSO (2.054 mL) was added tert-butyl 1,4-diazepane-1-carboxylate (201.3 mg, 1.005 mmol) and the resulting solution stirred at RT for 3 hours. After this time water was added and the aqueous layer extracted with EtOAc, and the combined organics dried (MgSO₄) and concentrated in vacuo. The resultant residue was taken up in DCM (3.000 mL) and treated with TFA (763.7 mg, 516.0 μL, 6.698 mmol) and the mixture stirred overnight at RT. The mixture was concentrated in vacuo and the residue taken up in dichloromethane (5 mL) and washed with NaHCO₃ aqueous solution. The organic layer was dried (MgSO₄), concentrated in vacuo and purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were collected and freeze-dried to give the title compound as a yellow solid (68.7 mg, 37% Yield). 1H NMR (400.0 MHz, DMSO) δ 1.95 (2H, m), 3.25-3.96 (8H, m partially hidden by water peak), 7.08 (2H, br s), 7.54-7.61 (5H, m), 7.78 (1H, s), 8.03-8.05 (2H, m), 8.19 (2H, m), 8.72 (2H, br s), 8.89 (1H, s); MS (ES⁺) 441.21

Example 7: 5-(pyridin-3-yl)-3-(5-(thiophen-2-yl)-4H-1,2,4-triazol-3-yl)pyrazin-2-amine (Compound IIIA-4)

Compound IIIA-4 was prepared using Method IV-G, Steps 1-5.

Method IV-G Step 1: Methyl 3-amino-6-bromopyrazine-2-carboxylate

A mixture of methyl 3-aminopyrazine-2-carboxylate (8.35 g, 54.53 mmol) and N-bromo-succinimide (9.705 g, 54.53 mmol) were stirred in MeCN (100 mL) at room temp for 16 hours. The resultant precipitate was filtered, washed with MeCN and dried under vacuum to give the desired product as a yellow solid (11.68 g, 92%). 1H NMR (400.0 MHz, DMSO) δ 3.85 (3H, s), 7.55 (2H, br s), 8.42 (1H, s); MS (ES⁺) 233.78

Step 2: 3-amino-6-(pyridin-3-yl)pyrazine-2-carboxylic acid

A mixture of methyl 3-amino-6-bromo-pyrazine-2-carboxylate (8 g, 34.48 mmol), diethyl-(3-pyridyl)borane (6.084 g, 41.38 mmol), dichloropalladium; triphenylphosphane (1.210 g, 1.724 mmol), disodium carbonate (51.70 mL of 2 M, 103.4 mmol) in DME (100 mL) were heated at 80° C. for 16 hours. The reaction mixture was cooled and treated with EtOAc and the resultant precipitate was isolated by filtration. Water was added to the solid and then the suspension heated and filtered hot. The solution was then allowed to cool and then acidified (AcOH) to approx pH 5. The precipitate was collected and washed with MeOH and dried under vacuum (6.23 g, 84% Yield). 1H NMR (400.0 MHz, DMSO) δ 7.47 (1H, m), 7.60 (2H, br s), 8.42-8.57 (2H, m), 8.97 (1H, s), 9.26 (1H, m); MS (ES⁺) 216.89

Step 3: Methyl 3-amino-6-(pyridin-3-yl)pyrazine-2-carboxylate

To 3-amino-6-(3-pyridyl)pyrazine-2-carboxylic acid (2 g, 9.251 mmol) in MeOH (50 mL) was added conc. H₂SO₄ (907.3 mg, 493.1 μL, 9.251 mmol) and the mixture heated to reflux for 2 hours. The solvent was removed under vacuum and the mixture neutralised with aqueous Na₂CO₃ and the resulting solid collected by filtration and dried to give the desired product (2.08 g, 97% Yield). MS (ES⁺) 231.87

Step 4: 3-amino-6-(pyridin-3-yl)pyrazine-2-carbohydrazide

Methyl 3-amino-6-(3-pyridyl)pyrazine-2-carboxylate (2 g, 8.687 mmol) was heated in hydrazine (1.392 g, 1.363 mL, 43.43 mmol) with a minimal amount of MeOH (5 mL) added at 80° C. for 2 hours. The reaction was treated with water and the product collected by filtration, washed with methanol and dried to give the desired product as a brown solid (1.17 g, 58% Yield). 1H NMR (400.0 MHz, DMSO) δ 7.43 (1H, m), 7.47 (2H, br s), 8.54 (2H, m), 8.90 (1H, s), 9.38 (1H, m), 10.16 (1H, br s); MS (ES⁺) 231.96

Step 5: 5-(pyridin-3-yl)-3-(5-(thiophen-2-yl)-4H-1,2,4-triazol-3-yl)pyrazin-2-amine

3-amino-6-(3-pyridyl)pyrazine-2-carbohydrazide (40 mg, 0.173 mmoles), thiophene-2-carboxamidine (21.92 mg, 0.173 mmoles) and sodium ethanolate (11.82 mg, 0.173 mmoles) were added to a microwave vial. DMF (1 mL) was then added and the vial sealed and heated in the microwave at 160° C. for 40 minutes. The reaction mixture was filtered and purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were collected and freeze-dried to give the title compound (23.4 mg, 31% Yield). 1H NMR (400.0 MHz, DMSO-d6) δ 14.96 (s, 1H), 9.55 (s, 1H), 8.99 (s, 1H), 8.84 (d, J=6.1 Hz, 1H), 8.69 (dd, J=1.2, 4.9 Hz, 1H), 7.95 (s, 2H), 7.81 (d, J=3.0 Hz, 1H), 7.73-7.68 (m, 2H) and 7.22 (dd, J=3.8, 4.8 Hz, 1H) ppm; MS (ES⁺) 323.10

Example 8A: N-(2-(5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)phenyl)ethanamide (Compound IA-267)

Compound IA-267 was prepared using Method IV-A, Steps 1-2, followed by Method IV-H, Step 1.

Method II-H Step 1: N-(2-(5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)phenyl)ethanamide

A solution of 5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (100 mg, 0.31 mmol), 2-ethanamidophenylboronic acid (56.25 mg, 0.31 mmol), tetrakis(triphenylphosphine)palladium (18.17 mg, 0.015 mmol) and Na₂CO₃ (471 μL, 2M aqueous solution) were added to a 10 mL microwave vial. Dioxane (3 mL) was then added and the vial sealed. The reaction mixture was heated in the microwave at 150° C. for 30 min. After this time methanol was added and the reaction mixture filtered. The solid was then washed with water (5 mL) and MeOH (5 mL) and dried under vacuum to give the product (31.0 mg, 28% yield); 1H NMR (400.0 MHz, DMSO) δ 2.04 (s, 3H), 7.26 (t, 1H), 7.44-7.40 (m, 1H), 7.69-7.67 (m, 4H), 7.80 (d, 2H), 8.15-8.13 (m, 3H), 8.73 (s, 1H) and 10.76 (s, 1H) ppm; MS (ES⁺) 373.0

The following compounds were all prepared using the method described for Compound IA-267 above.

Compound IA-75: 1H NMR (400.0 MHz, DMSO) 3.25 (s, 3H), 7.63 (s, 1H), 7.63 (dd, 2H), 7.74 (t, 3H), 7.90 (dd, 1H), 8.09 (dd, 2H), 8.40 (dd, 1H), 8.54 (t, 1H) and 9.00 (s, 1H) ppm; MS (ES⁺) 394.0

Compound IA-89: 5-(4-methylsulfonylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 393.0

Compound IA-93: 5-(1-naphthyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 365.0

Compound IA-94: 5-(2-(dimethylamino)phenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 359.0

Compound IA-96: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-[3-(trifluoromethyl)phenyl]pyrazin-2-amine; MS (ES⁺) 384.0

Compound IA-100: 3-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]benzamide; MS (ES+) 359.0

Compound IA-104: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-(3-thienyl)pyrazin-2-amine; MS (ES⁺) 322.0

Compound IA-105: methyl 2-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]benzoate; 1H NMR (400.0 MHz, DMSO) δ 3.61 (s, 3H), 7.56 (m, 1H), 7.65-7.72 (m, 7H), 7.87 (d, 1H), 8.16 (m, 2H) and 8.72 (s, 1H) ppm; MS (ES⁺) 374.0

Compound IA-110: 1-[4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]phenyl]ethanone; MS (ES⁺) 358.0

Compound IA-116: 5-(4-isopropylsulfonylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; 1H NMR (400.0 MHz, DMSO) δ 1.20 (d, 6H), 3.47 (t, 1H), 7.66-7.72 (m, 3H), 7.98 (d, 4H), 8.17-8.19 (m, 2H), 8.40 (dd, 2H), and 9.60 (s, 1H) ppm; MS (ES⁺) 422.0

Compound IA-118: 5-(2-((dimethylamino)methyl)phenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 373.0

Compound IA-125: 5-[2-(methoxymethyl)phenyl]-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 360.0

Compound IA-137: 2-[2-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]phenyl]ethanol; 1H NMR (400.0 MHz, DMSO) δ 2.89 (t, 2H), 3.74 (s, 2H), 4.61 (s, 1H), 7.32-7.43 (m, 3H), 7.47-7.49 (m, 1H), 7.61-7.69 (m, 5H), 8.13-8.16 (m, 2H) and 8.49 (s, 1H) ppm; MS (ES⁺) 360.0

Compound IA-141: 5-(4-pyridyl)-3-[5-(2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine; 1H NMR (400.0 MHz, DMSO) δ 7.22 (t, 1H), 7.38 (t, 1H), 7.80-7.82 (m, 1H), 8.04-8.09 (m, 4H), 8.70 (dd, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 323.1

Compound IA-144: N-[3-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]phenyl]methanesulfonamide; MS (ES⁺) 408.0

Compound IA-149: 5-(4-ethyl sulfonylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 408.0

Compound IA-150: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-[3-(trifluoromethoxy)phenyl]pyrazin-2-amine; MS (ES⁺) 400.0

Compound IA-169: 5-[4-(2-dimethylaminoethylsulfonyl)phenyl]-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 2.81 (s, 6H), 3.43-3.40 (m, 2H), 3.89-3.93 (m, 2H), 7.68-7.73 (m, 3H), 7.90 (br s, 2H), 8.07 (d, 2H), 8.17-8.19 (m, 2H), 8.45 (d, 2H) and 9.10 (s, 1H) ppm; MS (ES⁺) 451.0

Compound IA-170: 5-(3-furyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 306.0

Compound IA-174: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-[2(-trifluoromethyl)phenyl]pyrazin-2-amine; MS (ES⁺) 384.0

Compound IA-176: 5-(2-bromophenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 393.0

Compound IA-182: 5-(m-tolyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 330.0

Compound IA-190: 5-(2-methylsulfonylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 394.0

Compound IA-197: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-[4-(4-piperidylsulfonyl)phenyl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.76-1.70 (m, 2H), 2.08 (d, 2H), 2.89 (d, 2H), 3.37 (d, 2H), 3.66 (d, 1H), 7.70 (d, 2H), 7.82 (s, 1H), 7.86 (s, 1H), 7.98 (d, 2H), 8.13 (s, 1H), 8.18 (d, 2H), 8.44 (d, 2H), 8.63 (s, 1H) and 9.08 (s, 1H) ppm; MS (ES⁺) 463.0

Compound IA-202: [3-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]phenyl]methanol; MS (ES⁺) 346.0

Compound IA-210: 5-(1-ethylpyrazol-4-yl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 334.0

Compound IA-216: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-(8-quinolyl)pyrazin-2-amine; 1H NMR (400.0 MHz, DMSO) δ 7.63-7.71 (m, 4H), 7.82 (t, 3H), 8.10-8.15 (m, 3H), 8.26 (m, 1H), 8.53 (m, 1H), 9.01 (dd, 1H) and 9.14 (s, 1H) ppm; MS (ES⁺) 366.023

Compound IA-218: 4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]benzamide; MS (ES+) 359.0

Compound IA-221: 2-[2-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]phenyl]acetonitrile; MS (ES⁺) 355.0

Compound IA-230: 5-(2-methylsulfanylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 362.0

Compound IA-241: 5-(2-methylsulfinylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 378.0

Compound IA-244: 2-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N,N-dimethyl-benzamide; MS (ES⁺) 387.0

Compound IA-247: N-[4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]phenyl]acetamide; MS (ES⁺) 373.0

Compound IA-249: 1-[3-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]phenyl]ethanone; 1H NMR (400.0 MHz, DMSO) δ 2.70 (s, 3H), 7.67-7.71 (m, 4H), 8.00-8.02 (m, 1H), 8.17 (dd, 2H), 8.39 (d, 1H), 8.64 (d, 1H) and 9.05 (s, 1H) ppm; MS (ES⁺) 358.0

Compound IA-252: 3-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]benzonitrile; MS (ES⁺) 341.0

Compound IA-253: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-(2-vinylphenyl)pyrazin-2-amine; MS (ES⁺) 342.0

Compound IA-259: 5-(benzothiophen-7-yl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine; MS (ES⁺) 371.0

Compound IA-260: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-(5-quinolyl)pyrazin-2-amine; MS (ES⁺) 366.0

Compound IA-266: 2-[2-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]phenyl]acetamide; 1H NMR (400.0 MHz, DMSO) δ 3.64 (s, 2H), 6.88 (s, 1H), 7.40 (dd, 4H), 7.51-7.53 (m, 1H), 7.62 (s, 1H), 7.67 (dd, 4H), 8.12 (d, 2H) and 8.49 (s, 1H) ppm; MS (ES⁺) 373.0

Compound IA-271: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-(2-piperazin-1-yl-4-pyridyl)pyrazin-2-amine; MS (ES⁺) 400.0

Compound IA-274: 5-(4-methylsulfinylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 2.81 (s, 3H), 7.69 (d, 3H), 7.83 (d, 3H), 8.16-8.19 (m, 2H), 8.30-8.33 (m, 2H) and 9.02 (s, 1H) ppm; MS (ES⁺) 377.0

Example 9A: 4-[5-amino-6-[5-(2-chloroanilino)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-151)

Compound IA-151 was prepared using Method IV-C, Steps 1-2, followed by Method IV-I, Step 1.

Method IV-I Step 1: 4-[5-amino-6-[5-(2-chloroanilino)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

A solution of 2-chloroaniline (31.85 mg, 41.15 μL, 0.2497 mmol) in dichloromethane (2 mL) was slowly added dropwise to a solution of 1,1′-thiocarbonyldiimidazole (53.39 mg, 0.2996 mmol) in dichloromethane (1.5 mL) and the resulting solution stirred at room temperature for 1 h. Additional 1,1′-thiocarbonyldiimidazole (8.9 mg, 0.05 mmol) was added, and the reaction mixture stirred at room temperature overnight. The reaction mixture diluted with water and extracted with dichloromethane (3×5 mL). The organic extracts were dried over MgSO₄, filtered and evaporated to dryness to leave a yellow solid. The solid was re-dissolved in dichloromethane (1.5 mL) and 4-(5-amino-6-(hydrazinecarbonyl)pyrazin-2-yl)-N,N-dimethylbenzamide (75 mg, 0.2497 mmol) added and the reaction mixture stirred at room temperature for 48 h. The reaction mixture was evaporated to dryness and then triturated with EtOAc/Petrol/Ether to give a yellow solid, 4-[5-amino-6-[[(2 chlorophenyl)carbamothioylamino]carbamoyl]pyrazin-2-yl]-N,N-dimethyl-benzamide. This was re-dissolved in dichloromethane (1.5 mL) and EDC (71.81 mg, 0.3746 mmol) added and the resulting solution heated at 40° C. for 3 h. The reaction mixture was cooled to room temperature and concentrated in vacuo and the solid triturated with EtOAc and petroleum ether to yield the product as a yellow solid (28.9 mg, 26% yield); 1H NMR (400.0 MHz, DMSO) δ 2.96 (s, 3H), 3.01 (s, 3H), 7.15-7.25 (m, 1H), 7.40-7.49 (m, 1H), 7.53 (d, 3H), 7.70 (br s, 2H), 8.11 (d, 3H), 8.89 (s, 1H) and 10.45 (s, 1H) ppm; MS (ES⁺) 436.11

Example 10A: 4-[5-amino-6-[5-(p-tolyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-263)

Compound IA-263 was prepared using Method IV-B, Steps 1-2, followed by Method IV-J, Step 1.

Method IV-J Step 1: 4-[5-amino-6-[5-(p-tolyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

A solution of 4-[5-amino-6-[[(4-methylbenzoyl)amino]carbamoyl]pyrazin-2-yl]-N,N-dimethyl-benzamide (90 mg, 0.2151 mmol) and POCl₃ (3.298 g, 2.005 mL, 21.51 mmol) was heated at 110° C. for 2 h. After this time the reaction mixture was cooled to room temperature and ice added. Once all of the ice had melted the reaction mixture was extracted with dichloromethane (3×5 mL) and the combined organics dried over MgSO₄ and concentrated in vacuo. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions combined and lyophilised to leave the product as a yellow solid (21.2 mg, 20% yield); 1H NMR (400.0 MHz, DMSO) δ 2.22 (s, 3H), 2.75 (m, 6H), 7.26 (m, 2H), 7.32 (m, 2H), 7.58 (br s, 2H), 7.83 (m, 2H), 7.95 (m, 2H) and 8.77 (1H, s); MS (ES⁺) 401.15

The following compounds were all prepared using the method described for Compound IA-263 above.

Compound IA-135: 4-[5-amino-6-[5-(1-methylpyrrol-2-yl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.97 (m, 6H), 4.06 (s, 3H), 6.30 (m, 1H), 7.03 (m, 1H), 7.26 (m, 1H), 7.53-7.55 (m, 2H), 7.77 (br s, 2H), 8.15 (m, 2H) and 8.97 (1H, s) ppm; MS (ES⁺) 390.14

Example 11A: 4-[5-amino-6-[5-(azetidin-1-yl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-192)

Compound IA-192 was prepared using Method IV-C, Steps 1-2, followed by Method IV-K, Steps 1-2.

Method IV-K Step 1: 4-(5-amino-6-(5-oxo-4,5-dihydro-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide

DIPEA (86.08 mg, 116.0 μL, 0.6660 mmol) was added to a solution of 4-(5-amino-6-(hydrazinecarbonyl)pyrazin-2-yl)-N,N-dimethylbenzamide (100 mg, 0.3330 mmol) in DCM (6.500 mL) under nitrogen. A solution of triphosgene (39.53 mg, 0.1332 mmol) in DCM (100.0 μL) was then added dropwise to the stirred solution. The reaction mixture was stirred at room temperature for 2 h. The reaction mixture was filtered and the solid obtained dried under vacuum to yield the product (106 g mg, 98% yield); 1H NMR (400.0 MHz, DMSO) δ 2.96 (s, 3H), 3.00 (s, 3H), 7.33 (br s, 2H), 7.52 (d, 2H), 8.09 (d, 2H), 8.89 (s, 1H) and 12.98 (br s, 1H) ppm; MS (ES⁺) 327.12

Step 2: 4-[5-amino-6-[5-(azetidin-1-yl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

DIPEA (38.44 mg, 51.81 μL, 0.2974 mmol), azetidine (8.490 mg, 0.1487 mmol) and bromo(tripyrrolidin-1-yl)phosphonium hexafluorophosphate (76.27 mg, 0.1636 mmol) were added to a solution of 4-(5-amino-6-(5-oxo-4,5-dihydro-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide (50 mg, 0.1487 mmol) in DMF (485.1 μL) and the resulting solution stirred at room temperature for 2 h. The reaction mixture was filtered and purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10% -95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were concentrated in vacuo and triturated with dichloromethane/diethyl ether to give the product (8.6 mg, 15% yield); 1H NMR (400.0 MHz, DMSO) δ 2.96 (s, 3H), 3.00 (s, 6H), 4.25 (t, 4H), 7.52 (dd, 2H), 7.65 (br s, 1H), 8.04-8.06 (m, 2H) and 8.83 (s, 1H) ppm; MS (ES⁺) 366.21

The following compounds were all prepared using the method described for Compound IA-192 above.

Compound IA-250: 4-[5-amino-6-[5-(N-methylanilino)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide; MS (ES⁺) 416.18

Example 12A: 4-[5-amino-6-[5-(2-furyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-115)

Compound IA-115 was prepared using Method IV-B, Steps 1-2, followed by Method IV-L, Step 1.

Method IV-L Step 1: 4-[5-amino-6-[5-(2-furyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

Dibromo(triphenyl)phosphorane was added to a solution of 3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazine-2-carboxylic acid (100 mg, 0.35 mmol) and furan 2-carbohydrazide (44.1 mg, 0.35 mmol) in acetonitrile (3.0 mL) at room temperature. Bright yellow solution observed. The resulting solution was stirred at room temperature for 30 min. After this time, DIPEA (304 μL, 1.75 mmol) was added dropwise and the reaction mixture stirred at room temperature for 30 min. The reaction mixture was filtered to leave a yellow solid. The solid was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were freeze dried to give the product as a yellow solid (67.6 mg, 51% yield); 1H NMR (400.0 MHz, DMSO) δ 2.97 (m, 6H), 6.87 (m, 1H), 7.54-7.56 (m, 3H), 7.57 (br s, 2H), 8.15 (m, 3H) and 8.98 (1H, s) ppm; MS (ES⁺) 377.17

The following compounds were all prepared using a method similar to the one described for Compound IA-115 above.

Compound IA-71: 4-[5-amino-6-[5-(o-tolyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.74 (s, 3H), 2.98 (m, 6H), 7.48-7.62 (m, 5H), 7.80 (br s, 2H), 8.07 (m, 1H), 8.15 (m, 2H) and 8.99 (1H, s) ppm; MS (ES⁺) 401.21

Compound IA-87: 4-[5-amino-6-[5-(4-hydroxyphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.98 (m, 6H), 7.04 (m, 2H), 7.54 (m, 2H), 7.76 (br s, 2H), 8.01 (m, 2H), 8.16 (m, 2H), 8.97 (s, 1H) and 10.42 (s, 1H) ppm; MS (ES⁺) 403.16

Compound IA-101: 4-[5-amino-6-(5-cyclopropyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 1.14-1.18 (m, 2H), 1.22-1.25 (m, 2H), 2.40 (m, 1H), 3.01 (m, 6H), 7.54 (m, 2H), 7.68 (br s, 2H), 8.10 (m, 2H) and 8.93 (s, 1H) ppm; MS (ES⁺) 351.17

Compound IA-157: 4-[5-amino-6-[5-(4-methoxyphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.98 (m, 6H), 3.89 (s, 3H), 7.22 (m, 2H), 7.54 (m, 2H), 7.76 (br s, 2H), 8.10 (m, 2H), 8.16 (m, 2H) and 8.98 (s, 1H) ppm; MS (ES⁺) 417.18

Compound IA-167: 4-[5-amino-6-[5-(3-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide MS (ES⁺) 407.18

Compound IA-205: 4-[5-amino-6-[5-(2-iodophenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.96 (m, 6H), 7.43 (m, 1H), 7.52 (m, 2H), 7.69 (m, 1H), 7.81 (br s, 2H), 7.96 (m, 1H), 8.16 (m, 2H), 8.20 (m, 1H) and 9.01 (s, 1H) ppm; MS (ES⁺) 513.01

Compound IA-237: 4-[5-amino-6-[5-(m-tolyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.53 (s, 3H), 3.05 (m, 6H), 7.57-7.65 (m, 4H), 7.84 (br s, 2H), 8.04 (m, 2H), 8.23 (m, 2H) and 9.05 (s, 1H) ppm; MS (ES⁺) 401.2

Compound IA-242: 4-[5-amino-6-[5-(2-methoxyphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.97 (m, 6H), 3.97 (s, 3H), 7.19-7.23 (dt, 1H) 7.35 (m, 1H), 7.56 (m, 2H), 7.65-7.70 (m, 1H), 7.77 (br s, 2H), 7.99 (dd, 1H), 8.14 (m, 2H) and 8.98 (s, 1H) ppm; MS (ES⁺) 417.19

Compound IA-245: 4-[5-amino-6-[5-(5-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.60 (s, 3H), 2.98 (m, 6H), 7.08 (d, 1H), 7.53 (m, 2H), 7.74 (br s, 2H), 7.82 (m, 1H), 8.15 (m, 2H) and 8.97 (1H, s) ppm; MS (ES⁺) 407.12

Compound IA-262: 4-[5-amino-6-[5-(3-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.98 (m, 6H), 7.53 (m, 2H), 7.75-7.77 (m, 3H), 7.89 (m, 1H), 8.17 (m, 2H), 8.57 (m, 1H) and 8.98 (s, 1H) ppm; MS (ES⁺) 393.12

Example 13A: 4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-3-(difluoromethyl)-N,N-dimethyl-benzamide (Compound IA-126)

Compound IA-126 was prepared using Method IV-A, Steps 1-3, followed by Method IV-M, Step 1.

Method IV-M Step 1: 4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-3-(difluoromethyl)-N,N-dimethyl-benzamide

LiOH (495.9 μL of 1 M aq solution, 0.4959 mmol) was added to a suspension of methyl 4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-3-(difluoromethyl)benzoate (70 mg, 0.1653 mmol) in THF (5 mL) and methanol (2 mL). The reaction mixture was stirred for 4 h at room temperature and then concentrated in vacuo. The residue was acidified to pH2 by the addition of 1M HCl. A precipitate formed which was then filtered and washed with water, ethylacetate and ether. The solid was taken up in DMF (2 mL) and TBTU (79.63 mg, 0.2480 mmol) and DIPEA (64.09 mg, 86.37 μL, 0.4959 mmol) added followed by N-methylmethanamine (495.9 μL of 1 M, 0.4959 mmol) in THF. The resulting mixture was stirred at room temperature for 2 h, diluted with ethylacetate (5 mL), washed with water (2×5 mL) and concentrated in vacuo. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10% -95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were freeze dried to leave the product as a solid (29.6 mg, 40% yield); 1H NMR (400.0 MHz, DMSO) δ 3.0 (d, 6H), 7.6-7.7 (m, 4H), 7.82 (s, 1H), 7.9 (d, 2H), 8.15-8.18 (m, 2H) and 8.7 (s, 1H) ppm; MS (ES⁺) 437.2

The following compounds were all prepared using a method similar to the one described for Compound IA-126 above.

Compound IA-148: 4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-3-(2-fluorovinyl)-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 3.05 (d, 6H), 6.15 (dd, 0.5H), 6.85-6.95 (m, 1H), 7.1 (d, 0.25H), 7.45-7.55 (m, 2H), 7.6-7.7 (m, 5H), 7.8 (br s, 2H), 8.1-8.15 (m, 2H) and 8.45-8.48 (m, 1H) ppm; MS (ES⁺) 431.2

Compound IA-161: 4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N,N-dimethyl-3-oxazol-5-yl-benzamide 1H NMR (400.0 MHz, DMSO) δ 3.02 (d, 6H), 7.6-7.75 (m, 4H), 7.75-7.8 (m, 3H), 8.1 (d, 2H), 8.19 (s, 1H) and 8.19 (s, 1H) ppm; MS (ES⁺) 454.1

Example 14A: 5-(2-ethynylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (Compound IA-194)

Compound IA-194 was prepared using Method IV-A, Steps 1-2, followed by Method IV-N, Steps 1-3.

Method IV-N Step 1: di-tert-butyl 5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yliminodicarbonate

5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (4 g, 12.57 mmol) was suspended in DCM (59.76 mL) and THF (59.76 mL) and DMAP (153.6 mg, 1.257 mmol) was added. Di-tert-butyl dicarbonate (8.230 g, 8.663 mL, 37.71 mmol) was added in portions and the reaction allowed to stir at room temperature overnight. The reaction mixture was concentrated under reduced pressure and purified by column chromatography on silica gel eluting 10-20% EtAc/petrol to give the product as a cream coloured solid (5.72 g, 88% yield); 1H NMR (400.0 MHz, DMSO) δ 1.29 (s, 18H), 7.69 (d, 3H), 8.13 (d, 2H) and 9.17 (s, 1H) ppm

Step 2: tert butyl-5-(2-bromophenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl(tert-butoxycarbonyl)carbamate

A mixture of (2-bromophenyl)boronic acid (100 mg, 0.4979 mmol), tert-butyl N-[5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (258.1 mg, 0.4979 mmol), potassium carbonate (206.5 mg, 1.494 mmol) and triphenylphosphane palladium (13.06 mg, 11.54 μL, 0.04979 mmol) in DMF (3 mL) was heated at 50° C. for 1 h. The reaction mixture was cooled to room temperature and filtered through a Celite,™ pad. The pad was washed with ethyl acetate (1×10 mL) and the combined filtrates were washed with water (2×10 mL) and brine (1×10 mL), dried over MgSO₄ and concentrated to leave the product as a solid which was used directly in the next step without further purification.

Step 3: 5-(2-ethynylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

A suspension of tert-butyl N-[5-(2-bromophenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (100 mg, 0.1682 mmol), copper iodided (9.612 mg, 0.05047 mmol), dichloropalladium; triphenylphosphane (35.42 mg, 0.05046 mmol), triethylamine (211.0 μL, 1.514 mmol) and ethynyl(trimethyl)silane (85.58 μL, 0.6056 mmol) were heated at 60° C. in toluene (10 mL) for 1 h. The reaction mixture was cooled to room temperature and filtered through a Celite™ pad and the filtrate concentrated in vacuo to leave an oil. This was purified by column chromatography on silica eluting with diethyl ether/petroleum ether as eluent to yield the product as a yellow oil. This oil was dissolved in THF (2 mL) followed by the addition of tetrabutylammonium fluoride (336.4 μL of 1 M, 0.3364 mmol) and the resulting solution stirred at room temperature for 1 h. The mixture was diluted with ethylacetate (5 mL), washed with water and brine and concentrated in vacuo to leave a solid. The solid was dissolved in dichloromethane (10 mL) and trifluoroacetic acid (19.18 mg, 12.96 μL, 0.1682 mmol) was added. The resulting mixture was stirred at room temperature for 1 h and then concentrated in vacuo to leave an oil which was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were freeze dried to leave the product as a solid (12.0 mg, 24% yield); 1H NMR (400.0 MHz, MeOD) δ 2.77 (s, 1H), 6.42-6.5 (m, 1H), 6.55-6.62 (m, 1H), 6.6-6.75 (m, 4H), 6.82 (d, 1H), 7.3 (d, 1H) and 7.83 (s, 1H) ppm; MS (ES⁺) 340.1

Example 15A:_4-(5-amino-6-(5-(2-vinylphenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide (Compound IA-77)

Compound IA-77 was prepared using Method IV-B, Steps 1-2, followed by Method IV-L, Step 1, followed by Method IV-O, Step 1.

Method IV-O Step 1: 4-(5-amino-6-(5-(2-vinylphenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide

A solution of 4-[5-amino-6-[5-(2-iodophenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (100 mg, 0.1952 mmol), potassium trifluoro-vinyl-boron (31.37 mg, 0.2342 mmol), triethyl amine (81.63 μL, 0.5857 mmol) and cyclopenta-1,4-dien-1-yl(diphenyl)phosphane; dichloromethane; dichloropalladium; iron (31.88 mg, 0.03904 mmol) in propanol (2.000 mL) was degassed and flushed with nitrogen (3×) and the resulting solution heated at 100° C. for 1 h. The reaction mixture cooled to room temperature and concentrated in vacuo. The residue was purified by column chromatography on silica eluting with ethyl acetate. Product fractions were combined and concentrated in vacuo to leave the product as a yellow solid (43.1 mg, 53% yield); 1H NMR (400.0 MHz, DMSO) δ 2.97 (m, 6H), 5.51 (m, 1H), 5.98 (m, 1H), 7.54 (m, 2H), 7.58-7.70 (m, 3H), 7.78 (br s, 2H), 7.89 (m, 1H), 8.06 (m, 2H) and 9.00 (s, 1H) ppm; MS (ES⁺) 413.15

Example 16A: 2-(5-amino-6-(5-(thiophen-2-yl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-5-(1,4-diazepane-1-carbonyl)benzonitrile (Compound IA-152)

Compound IA-152 was prepared using Method IV-P, Steps 1-2.

Method IV-P Step 1: 5-bromo-3-(5-(thiophen-2-yl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

3-amino-6-bromo-pyrazine-2-carboxylic acid (3.2 g, 14.68 mmol) and thiophene-2-carbohydrazide (2.152 g, 14.68 mmol) were suspended in acetonitrile (48.00 mL) at room temperature and dibromo(triphenyl)phosphorane (24.79 g, 58.72 mmol) was added, followed by additional acetonitrile (16.00 mL). The reaction mixture turned bright yellow in colour and was stirred at room temperature for 1 h. After this time, the reaction mixture cooled in an icebath and DIPEA (7.209 g, 9.716 mL, 55.78 mmol) was added dropwise. The reaction mixture was stirred in the ice bath for 1 h and then additional DIPEA (2.277 g, 3.069 mL, 17.62 mmol) added and the reaction mixture stirred for left for 30 mins and further DIPEA (1.897 g, 2.557 mL, 14.68 mmol) added. The reaction mixture was stirred for 1 h and then filtered. The solid was washed with ether, isolated and then triturated with acetonitrile and washed with ether to give the product as a yellow solid (2.776 g, 57% yield); 1H NMR (400.0 MHz, DMSO) 7.35 (s, 1H), 7.80 (br s, 2H), 7.98 (m, 1H), 8.04 (m, 1H) and 8.45 (s, 1H); MS (ES⁺) 326.04

Step 2: 2-(5-amino-6-(5-(thiophen-2-yl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-5-(1,4-diazepane-1-carbonyl)benzonitrile

tert-Butyl 4-(4-bromo-3-cyano-benzoyl)-1,4-diazepane-1-carboxylate (126.0 mg, 0.3085 mmol), potassium acetate (90.83 mg, 0.9255 mmol), 4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane (117.5 mg, 0.4628 mmol) and 1-cyclopenta-1,4-dienyl-diphenyl-phosphane; dichloromethane; dichloropalladium; iron (25.19 mg, 0.03085 mmol) were heated in dioxane (3 mL) at 80° C. for 3 h. Sodium carbonate (462.8 μL of 2 M, 0.9255 mmol) was added to the reaction mixture followed by tert-butyl 4-(4-bromo-3-cyano-benzoyl)-1,4-diazepane-1-carboxylate (126.0 mg, 0.3085 mmol) and palladium; triphenylphosphane (35.65 mg, 0.03085 mmol) and the reaction mixture evacuated and flushed with nitrogen (3 cycles) and then heated at 150° C. in the microwave for 1 h.

The reaction mixture was diluted with water (10 mL) and EtOAc (10 ml). The layers were separated and the aqueous layer extracted with EtOAc (3×10 mL). The combined organic extracted were dried over MgSO₄, filtered and evaporated to dryness to give a brown/black solid. This solid was re-dissolved in MeOH/DCM (4 mL) and solution filtered through thiol cartridges to leave a brown solid. This was triturated with acetonitrile to give the product as a yellow solid. The yellow solid was redissolved in DCM (3 mL) and TFA (500 μL, 6.490 mmol) added and the resulting mixture stirred at room temperature for 15 mins. This solution was evaporated to dryness and then MeOH/DCM added and the mixture concentrated in vacuo again. The solid was then re-dissolved in acetonitrile/water and passed through a bicarbonate cartridge. The filtrate was then freeze dried to leave the product as a yellow solid (29.8 mg, 20% yield); 1H NMR (400.0 MHz, DMSO) δ 1.60 (br s, 1H), 1.75 (br s, 1H), 2.70-2.80 (m, 3H), 2.90 (m, 1H), 3.35 (m, 3H), 3.60-3.70 (m, 2H), 7.30-7.40 (m, 1H), 7.80-7.90 (m, 2H), 7.95-8.15 (m, 5H) and 8.89 (s, 1H) ppm; MS (ES⁺) 473.26

The following compounds were all prepared using a method similar to the one described for Compound IA-152 above.

Compound IA-179: 5-(2-methylsulfinylphenyl)-3-[5-(3-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 2.7 (s, 3H), 3.1 (s, 3H), 7.2-7.25 (m, 1H), 7.6-7.8 (m, 3H), 7.9 (s, 1H), 8.05 (d, 1H), 8.25 (d, 1H) and 8.95 (s, 1H) ppm; MS (ES⁺) 398.1

Example 17A: 3-(5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)pyridine-4-carbonitrile (Compound IA-153)

Compound IA-153 was prepared using Method IV-A, Steps 1-2, followed by Method IV-N, Step 1, followed by Method IV-Q, Steps 1-2.

Method IV-Q Step 1: di-tert-butyl 5-(4-cyanopyridin-3-yl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yliminodicarbonate

tert-Butyl N-[5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (150 mg, 0.2894 mmol), 3-(5,5-dimethyl-1,3,2-dioxaborinan-2-yl)pyridine-2-carbonitrile (75.03 mg, 0.3473 mmol), cesium fluoride (87.92 mg, 0.5788 mmol), copper iodide (5.512 mg, 0.9790 μL, 0.02894 mmol), and palladium; triphenylphosphane (16.72 mg, 0.01447 mmol) were placed in a microwave tube which was evacuated and nitrogen flushed (×5). Dioxane (2.486 mL) was added and the reaction mixture stirred during 5 further vacuum/flush cycles. The resulting solution was heated at 85° C. overnight, cooled to room temperature diluted with ethyl acetate. The mixture was washed with aq NaHCO₃ solution (1×10 mL) and brine (1×10 mL), dried over MgSO₄ and concentrated under reduced pressure. The material was purified by column chromatography on silica gel eluting 50-60% ethyl acetate/petroleum ether to give the product as a colourless foam. (136 mg, 86.8%); 1H NMR (400.0 MHz, DMSO) 1.34 (s, 18H), 7.19 (s, 2H), 7.49 (m, 3H), 7.75 (m, 1H), 8.17 (m, 2H), 8.40 (m, 1H), 8.90 (m, 1H) and 9.12 (s, 1H) ppm

Step 2: 3-(5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)pyridine-4-carbonitrile

tert-Butyl N-tert-butoxycarbonyl-N-[5-(4-cyano-3-pyridyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]carbamate (140 mg, 0.2585 mmol) in dichloromethane (2 mL) was treated with TFA (2 mL, 25.96 mmol) and stirred at room temperature for 1 h. The mixture was concentrated under reduced pressure, re-dissolved in MeOH/DCM and concentrated (2×), dissolved MeOH/DCM and passed through bicarbonate cartridge, concentrated under reduced pressure to give a yellow solid. The solid was triturated with acetonitrile and filtered to give yellow solid (83 mg, 94%); 1H NMR (400.0 MHz, DMSO) δ 7.69-7.77 (m, 3H), 8.07 (d, 1H), 8.24-8.26 (m, 2H), 7.80-8.40 (br s, 2H), 8.90 (d, 1H), 9.09 (s, 1H) and 9.47 (s, 1H) ppm; MS (ES⁺) 342.16

The following compounds were all prepared using a method similar to the one described for Compound IA-153 above.

Compound IA-74: 3-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]pyridine-2-carbonitrile 1H NMR (400.0 MHz, DMSO) δ 7.64-7.70 (m, 3H), 7.86-7.89 (m, 1H), 8.18-8.20 (m, 2H), 8.54-8.57 (m, 1H), 8.79-8.81 (m, 1H) and 8.94 (s, 1H) ppm; MS (ES⁺) 342.16

Compound IA-132: 2-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-5-isopropylsulfonyl-benzonitrile 1H NMR (400.0 MHz, CDCl₃) δ 1.35 (d, 6H), 7.5-7.6 (m, 4H), 8.0-8.05 (m, 1H), 8.1-8.15 (m, 1H), 8.2-8.25 (m, 2H), 8.3-8.32 (m, 1H) and 8.7 (s, 1H) ppm; MS (ES⁺) 447.2

Example 18A: 4-(5-amino-6-(5-(3-nitrophenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide (Compound IA-286)

Compound IA-286 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1.

Method IV-R Step 1: 4-(5-amino-6-(5-(3-nitrophenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide

Dibromo(triphenyl)phosphorane (707.8 mg, 1.68 mmol) was added to a solution of 3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazine-2-carboxylic acid (100 mg, 0.35 mmol) and 4-(5-amino-6-(hydrazinecarbonyl)pyrazin-2-yl)-N,N-dimethylbenzamide (63.28 mg, 0.35 mmol) in acetonitrile (5 mL) at room temperature. A bright yellow solution was observed. The reaction mixture was stirred at room temperature for 30 min. DIPEA (304 μL, 1.75 mmol) was added dropwise and the reaction mixture was stirred at room temperature for 30 min. The reaction mixture was filtered and the solid triturated with acetonitrile to give the product as a yellow solid (78.5 mg, 51.3% yield); 1H NMR (400.0 MHz, DMSO) δ 2.98 (m, 6H), 7.56 (m, 2H), 7.85 (br s, 1H), 7.99 (t, 1H), 8.17 (m, 2H), 8.52 (m, 1H), 8.56 (m, 1H), 8.82 (m, 1H) and 9.02 (s, 1H) ppm; MS (ES⁺) 432.2

The following compounds were all prepared using a method similar to the one described for Compound IA-286 above.

Compound IA-85: 4-[5-amino-6-[5-(3-hydroxyphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 3.02 (m, 6H), 7.11 (m, 1H), 7.52 (m, 1H), 7.59 (m, 3H), 7.64 (m, 1H), 7.84 (br s, 2H), 8.22 (m, 2H), 9.04 (s, 1H) and 10.13 (1H, s) ppm; MS (ES⁺) 402.23

Compound IA-180: 4-[5-amino-6-(5-thiazol-4-yl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.78 (m, 6H), 7.35 (m, 2H), 7.60 (br s, 1H), 7.94 (m, 2H), 8.62 (m, 1H), 8.79 (s, 1H) and 9.22 (m, 1H) ppm; MS (ES⁺) 394.15

Compound IA-187: 3-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]benzonitrile 1H NMR (400.0 MHz, DMSO) δ 1.20 (d, 6H), 3.47 (q, 1H), 7.92 (br s, 2H), 7.90 (t, 1H), 7.99 (m, 2H), 8.19 (dt, 1H), 8.41-8.43 (m, 2H), 8.48-8.51 (m, 1H), 8.58 (t, 1H) and 9.09 (s, 1H) ppm; MS (ES⁺) 447.2

Compound IA-189: 4-[5-amino-6-[5-(3-cyano-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.97 (m, 6H), 7.50 (m, 2H), 7.80 (m, 1H), 8.21 (m, 3H) and 9.05 (s, 1H) ppm; MS (ES⁺) 418.15

Compound IA-215: 4-[5-amino-6-[5-(2-hydroxyphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.97 (s, 3H), 3.01 (s, 3H), 7.09-7.14 (m, 2H), 7.53-7.55 (m, 3H), 7.80 (br s, 2H), 7.93 (dd, 1H), 8.16 (d, 2H), 8.99 (s, 1H) and 10.45 (s, 1H) ppm; MS (ES⁺) 403.23

Compound IA-246: 4-[5-amino-6-[5-(4-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.34 (s, 3H), 2.98 (m, 6H), 7.54 (m, 2H), 7.62 (s, 1H), 7.75 (br s, 2H), 7.85 (s, 1H), 8.15 (m, 2H) and 8.98 (s, 1H) ppm; MS (ES⁺) 407.18

Compound IA-273: 4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]benzonitrile 1H NMR (400.0 MHz, DMSO) δ 1.20 (d, 6H), 3.48 (m, 1H), 7.99 (d, 2H), 7.80-8.30 (br s, 2H), 8.15 (d, 2H), 8.34 (d, 2H), 8.40 (d, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 447.19

Example 19A: 5-(2-(isopropylsulfinyl)phenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (Compound IA-136)

Compound IA-136 was prepared using Method IV-A, Steps 1-3, followed by Method IV-S, Step 1.

Method IV-S Step 1: 5-(2-(isopropylsulfinyl)phenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

5-(2-isopropylsulfanylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (50 mg, 0.1284 mmol) was dissolved in dichloromethane (10 mL) and cooled to 0° C. in an ice-bath. 3-Chlorobenzenecarboperoxoic acid (26.59 mg, 0.1541 mmol) was added in one portion with rapid stirring. The mixture was stirred at 0° C. for 15 min, washed with saturated aqueous NaHCO₃ solution (1×5 mL) and brine (1×5 mL), dried over MgSO₄ and concentrated in vacuo to leave a solid which was purified by column chromatography on silica eluting with ether/petroleum ether to yield the product as a yellow solid (16.1 mg, 31% yield); 1H NMR (400.0 MHz, CDCl₃) δ 1.2 (d, 3H), 1.35 (d, 3H), 3.5-3.6 (m, 1H), 7.5-7.75 (m, 2H), 7.5-7.65 (m, 7H), 8.25 (d, 2H) and 8.55 (s, 1H) ppm; MS (ES⁺) 406.1

The following compounds were all prepared using a method similar to the one described for Compound IA-136 above.

Compound IA-256: 5-(2-ethylsulfinylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, CDCl₃) δ 1.25-1.4 (m, 3H), 3.3-3.6 (m, 2H), 7.6-7.8 (m, 6H), 8.2 (d, 2H), 8.4 (d, 1H) and 8.6 (s, 1H) ppm; MS (ES⁺) 392.2

Example 20A: 5-(2-isopropylsulfonylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (Compound IA-121)

Compound IA-121 was prepared using Method IV-A, Steps 1-3, followed by Method IV-T, Step 1.

Method IV-T Step 1: 5-(2-isopropylsulfonylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

5-(2-isopropylsulfanylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (40 mg, 0.1027 mmol) was dissolved in dichloromethane (10 mL) followed by the portionwise addition of 3-chlorobenzenecarboperoxoic acid (70.89 mg, 0.4108 mmol) over 10 min. The resulting mixture was stirred at room temperature for 2 h, and poured onto a 50/50 mixture of saturated aqueous sodium thiosulfate solution and saturated aqueous sodium bicarbonate solution (20 mL). The layers were separated and the organic layer was washed with dilute NaHCO₃ solution (1×10 mL) and brine (1×10 mL) and then concentrated in vacuo to leave a solid. The solid was purified by column chromatography on silica eluting with 50% ether/petroleum ether to afford the product as a yellow solid. (20.25 mg, 36% yield); 1H NMR (400.0 MHz, CDCl₃) δ 1.4 (d, 6H), 4.48-4.52 (m, 1H), 7.0 (br s, 2H), 7.5-7.7 (m, 5H), 7.7-7.75 (m, 1H), 8.2 (d, 1H), 8.3 (d, 1H) and 8.55 (s, 1H) ppm; MS (ES⁺) 422.2

The following compounds were all prepared using a method similar to the one described for Compound IA-121 above.

Compound IA-164: tert-butyl N-[2-[2-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]phenyl]sulfinylethyl]carbamate 1H NMR (400.0 MHz, CDCl₃) δ 1.55 (s, 9H), 3.45-3.5 (m, 1H), 3.6-3.7 (m, 3H), 5.5 (br s, 1H), 7.6-7.8 (m, 6H), 8.2-8.25 (m, 2H), 8.3 (d, 1H) and 8.6 (s, 1H) ppm; MS (ES⁺) 507.2

Compound IA-203: 5-(2-ethylsulfonylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, CDCl₃) δ 1.2 (d, 3H), 1.35 (d, 3H), 3.5-3.6 (m, 1H), 7.5-7.75 (m, 2H), 7.5-7.65 (m, 7H), 8.25 (d, 2H) and 8.55 (s, 1H) ppm; MS (ES⁺) 408.2

Compound IA-280: 5-(4-tert-butylsulfonylphenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.32 (s, 9H), 7.7-7.8 (m, 3H), 7.9-8.0 (m, 3H), 8.20-8.25 (m, 2H), 8.45 (d, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 436.2

Example 21A: 4-(5-amino-6-(5-(2-ethoxyphenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide (Compound IA-277)

Compound IA-277 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-U, Step 1.

Method IV-U Step 1: 4-(5-amino-6-(5-(2-ethoxyphenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide

Potassium carbonate (25.46 mg, 0.1842 mmol) was added to a mixture of 4-[5-amino-6-[5-(2-hydroxyphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (50 mg, 0.1228 mmol) in DMF (1 mL) at room temperature. Colour change observed from yellow to orange. The resulting suspension was heated at 60-65° C. and bromoethane (14.72 mg, 10.01 μL, 0.1351 mmol) was added slowly. After the addition is complete the reaction heated at 60-65° C. for 30 min. The reaction mixture was cooled to room temperature. Water (2 mL) was added slowly at and the mixture stirred at room temperature for 20 min. A precipitate formed and was filtered and washed with water. The solid was re-dissolved in DCM and dried over MgSO₄, filtered and evaporated to dryness. The solid was triturated with acetonitrile to give the product as a yellow solid (38.3 mg, 73% yield); 1H NMR (400.0 MHz, DMSO) δ 1.49 (t, 3H), 2.97-3.02 (m, 6H), 4.24-4.29 (m, 2H), 7.17-7.18 (m, 1H), 7.20 (d, 1H), 7.32-7.35 (m, 2H), 7.53 (d, 1H), 7.65 (br s, 2H), 8.05 (d, 1H), 8.17 (d, 2H) and 8.99 (s, 1H) ppm; MS (ES⁺) 431.24

The following compounds were all prepared using a method similar to the one described for Compound IA-277 above.

Compound IA-108: 4-[5-amino-6-[5-(2-isopropoxyphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 1.40 (d, 6H), 2.99 (s, 3H), 3.01 (s, 3H), 4.90 (q, 1H), 7.20 (t, 1H), 7.39 (d, 1H), 7.51-7.53 (m, 2H), 7.55-7.65 (m, 1H), 7.80 (br s, 2H), 8.05-8.10 (m, 1H), 8.17-8.20 (m, 2H) and 8.99 (s, 1H) ppm; MS (ES⁺) 445.27

Compound IA-175: tert-butyl N-[2-[2-[5-[3-amino-6-[4-(dimethylcarbamoyl) phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenoxy]ethyl]carbamate 1H NMR (400.0 MHz, DMSO) δ 1.29 (s, 9H), 2.96 (s, 3H), 3.00 (s, 3H), 3.50 (d, 2H), 4.18 (s, 2H), 6.96-6.99 (m, 1H), 7.19-7.25 (m, 1H), 7.35 (d, 1H), 7.53 (d, 2H), 7.66-7.67 (m, 1H), 7.80 (br s, 2H), 8.06-8.08 (m, 1H), 8.16 (d, 2H) and 8.99 (s, 1H) ppm; MS (ES⁺) 546.27

Compound IA-196: 4-[5-amino-6-[5-[2-(2-hydroxyethoxy)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.98 (s, 3H), 3.00 (s, 3H), 3.86-3.89 (m, 2H), 4.23 (s, 2H), 4.85 (t, 1H), 7.19-7.22 (m, 1H), 7.35-7.37 (m, 1H), 7.54 (d, 2H), 7.63-7.67 (m, 1H), 7.79 (br s, 2H), 8.02-8.04 (m, 1H), 8.18 (s, 2H) and 8.99 (s, 1H) ppm; MS (ES⁺) 447.24

Compound IA-284: 4-[5-amino-6-[5-[2-(3-hydroxypropoxy)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.00 (s, 2H), 2.97 (s, 3H), 3.01 (s, 3H), 3.65 (d, 2H), 4.26 (s, 2H), 4.55 (s, 1H), 7.19 (s, 1H), 7.35 (s, 1H), 7.54 (d, 2H), 7.70 (br s, 2H), 8.03 (d, 1H), 8.16 (d, 2H) and 8.98 (s, 1H) ppm; MS (ES⁺) 461.26

Example 22A: 4-(5-amino-6-(5-(2-aminophenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide (Compound IA-99)

Compound IA-99 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-V, Step 1.

Method IV-V Step 1: 4-(5-amino-6-(5-(2-aminophenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide

SnCl₂.2H₂O (151.6 mg, 0.6720 mmol) was added to a solution of 4-[5-amino-6-[5-(2-nitrophenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (58 mg, 0.1344 mmol) in EtOAc (3 mL) and dichloromethane (1 mL) at room temperature and the resulting solution stirred overnight at room temperature. The reaction mixture was poured carefully onto saturated aqueous sodium hydrogen carbonate solution (5 mL) and the layers separated. The aqueous layer extracted further with dichloromethane (2×15 mL) and the combined organics dried over MgSO4 and concentrated in vacuo to leave a yellow solid. This was purified using by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were freeze dried to give the product as a yellow solid (17.2 mg, 34% yield); 1H NMR (400.0 MHz, DMSO) δ 2.98 (m, 6H), 6.78 (t, 1H), 6.88 (br s, 1H), 7.34 (m, 1H), 7.55 (m, 2H), 7.79 (br s, 2H), 7.85 (m, 1H), 8.18 (m, 2H) and 8.99 (s, 1H) ppm; MS (ES⁺) 402.26

The following compounds were all prepared using a method similar to the one described for Compound IA-99 above.

Compound IA-142: 4-[5-amino-6-[5-(3-aminophenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 2.98 (m, 6H), 6.88 (m, 1H), 7.31 (m, 2H), 7.41 (m, 1H), 7.56 (m, 2H), 7.78 (br s, 2H), 8.15 (m, 2H) and 8.98 (s, 1H) ppm; MS (ES⁺) 402.19

Example 23A: 5-(6-(4-methylpiperazin-1-yl)pyridin-3-yl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (Compound IA-200)

Compound IA-200 was prepared using Method IV-A, Steps 1-2, followed by Method IV-N, Step 1, followed by Method IV-W, Steps 1-2.

Method IV-W Step 1: Di-tert-butyl(5-(6-(4-methylpiperazin-1-yl)pyridin-3-yl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)iminodicarbonate

tert-Butyl N-[5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (100 mg, 0.19 mmol) was dissolved in DMF (1 mL) and 1-methyl-4-(5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)piperazine (70.19 mg, 0.23 mmol) and Pd(PPh₃)₂Cl₂ (13.54 mg, 0.019 mmol) were added. K₂CO₃ (289 μL, 0.58 mmol, 2M aqueous solution) was added and the reaction mixture heated at 100° C. for 12 hours. The reaction mixture was cooled to room temperature and taken onto the next step without further purification.

Step 2: 5-(6-(4-methylpiperazin-1-yl)pyridin-3-yl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

Di-tert-butyl(5-(6-(4-methylpiperazin-1-yl)pyridin-3-yl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)iminodicarbonate(118.6 mg, 0.19 mmol) as a solution in DMF (1 mL) was diluted with dichloromethane (5 mL) and was treated with TFA (1 mL, 12.98 mmol). The resulting solution was stirred at room temperature for 18 h and then concentrated in vacuo. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were collected and freeze-dried to give the product as a yellow solid (27.3 mg, 27% yield); 1H NMR (400.0 MHz, DMSO) δ 2.87 (d, 3H), 3.08-3.21 (m, 4H), 3.40-3.53 (m, 2H), 4.52 (d, 2H), 7.12 (d, 1H), 7.66-7.70 (m, 5H), 8.16-8.18 (m, 2H), 8.33 (dd, 1H), 8.92 (s, 1H), 8.93 (d, 1H) and 9.75 (br s, 1H) ppm; MS (ES⁺) 415.2

The following compounds were all prepared using a method similar to the one described for Compound IA-200 above.

Compound IA-72: 5-[6-(2-morpholinoethylamino)-3-pyridyl]-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, CDCl₃) δ 3.17 (br s, 4H), 3.29 (t, 2H), 3.92-3.94 (m, 6H), 7.03 (d, 1H), 7.51-7.58 (m, 3H), 8.18-8.21 (m, 2H), 8.38 (d, 1H), 8.49 (s, 1H) and 8.52 (s, 1H) ppm; MS (ES⁺) 445.2

Compound IA-86: 5-(3-methoxy-4-pyridyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 4.09 (s, 3H), 7.66-7.72 (m, 3H), 7.96 (br s, 2H), 8.12 (br d, 1H), 8.17 (dd, 2H), 8.47 (d, 1H), 8.64 (s, 1H) and 9.03 (s, 1H) ppm; MS (ES⁺) 347.1

Compound IA-117: 5-(6-methoxy-3-pyridyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 3.93 (s, 3H), 6.99 (d, 1H), 7.67-7.73 (m, 5H), 8.17-8.20 (m, 2H), 8.42 (dd, 1H), 8.93 (d, 1H) and 8.95 (s, 1H) ppm; MS (ES⁺) 347.1

Compound IA-165: 5-[2-(2-dimethylaminoethyloxy)-4-pyridyl]-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 2.23 (s, 6H), 2.65 (t, 2H), 4.41 (t, 2H), 7.49 (s, 1H), 7.69-7.73 (m, 4H), 7.95 (br s, 2H), 8.16-8.19 (m, 2H), 8.28 (d, 1H) and 9.07 (s, 1H) ppm; MS (ES⁺) 404.1

Compound IA-186: 3-(5-phenyl-1,3,4-oxadiazol-2-yl)-5-(6-piperazin-1-yl-3-pyridyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 3.00 (br d, 4H), 3.58 (br t, 4H), 6.86 (d, 1H), 7.42-7.48 (m, 5H), 7.94 (dd, 2H), 8.09 (dd, 1H), 8.53 (br s, 2H), 8.68 (s, 1H) and 8.69 (d, 1H) ppm

Compound IA-265: N′-[4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-2-pyridyl]-N,N-dimethyl-ethane-1,2-diamine 1H NMR (400.0 MHz, DMSO) δ 2.20 (s, 6H), 2.45 (t, 2H), 3.41 (q, 2H), 6.54 (t, 1H), 7.18 (dd, 1H), 7.21 (s, 1H), 7.67-7.74 (m, 3H), 7.86 (br s, 2H), 8.08 (d, 1H), 8.18 (dd, 2H) and 8.89 (s, 1H) ppm; MS (ES⁺) 403.2

Compound IA-279:_5-[6-[3-(dimethylamino)propoxy]-3-pyridyl]-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.89 (quin, 2H), 2.16 (s, 6H), 2.36 (t, 2H), 4.35 (t, 2H), 6.96 (d, 1H), 7.68-7.71 (m, 5H), 8.17-8.19 (m, 2H), 8.40 (dd, 1H), 8.91 (d, 1H) and 8.94 (s, 1H) ppm; MS (ES⁺) 418.2

Compound IA-283: 5-(6-morpholino-3-pyridyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 3.33-3.35 (m, 4H), 3.52-3.54 (m, 4H), 6.79 (d, 1H), 7.42-7.51 (m, 5H), 7.95-7.97 (m, 2H), 8.07 (dd, 1H) and 8.69 (s, 2H) ppm; MS (ES⁺) 402.1

Example 24A: 5-(2-(2-aminoethylthio)phenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (Compound IA-224)

Compound IA-224 was prepared using Method IV-A, Steps 1-3, followed by Method IV-Q, Step 2.

Compound IA-224: 5-(2-(2-aminoethylthio)phenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 2.9-3.0 (m, 2H), 3.2 (t, 2H), 7.8 (t, 1H), 7.95 (t, 1H), 7.6-7.75 (m, 5H), 7.75-7.85 (br s, 3H), 8.15 (d, 2H) and 8.55 (s, 1H) ppm; MS (ES⁺) 391.2

Example 25A: 5-(2-(2-aminoethylsulfinyl)phenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (Compound IA-261)

Compound IA-261 was prepared using Method IV-A, Steps 1-3, followed by Method IV-S, Step 1, followed by Method IV-Q, Step 2.

Compound IA-261: 5-(2-(2-aminoethylsulfinyl)phenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 2.9-3.0 (m, 1H), 3.1-3.2 (m, 1H), 3.3-3.4 (m, 1H), 3.55-3.62 (m, 1H), 7.6-7.75 (m, 8H), 7.8-7.9 (m, 2H), 8.2-8.3 (m, 4H) and 8.55 (s, 1H) ppm; MS (ES⁺) 407.2

Example 26A: 4-[5-amino-6-[5-(6-amino-2-pyridyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-231)

Compound IA-231 was prepared using Method IV-C, Steps 1-2, followed by Method IV-X, Steps 1-2.

Method IV-X Step 1: 4-(5-amino-6-(2-(6-aminopyridine-2-carbonyl)hydrazinecarbonyl) pyrazin-2-yl)-N,N-dimethylbenzamide

A solution of 4-[5-amino-6-(hydrazinecarbonyl)pyrazin-2-yl]-N,N-dimethyl-benzamide (100 mg, 0.3163 mmol) and 6-aminopyridine-2-carboxylic acid (43.69 mg, 0.3163 mmol) in DMF (1.000 mL) was treated with triethylamine (32.01 mg, 44.09 μL, 0.3163 mmol) then warmed slightly. The mixture was cooled to room temperature and then treated with (benzotriazol-1-yloxy-dimethylamino-methylene)-dimethyl-ammonium tetrafluoroborate (121.9 mg, 0.3796 mmol) and stirred at room temperature overnight. The mixture was poured dropwise onto water (5 ml) with rapid stirring, stirred at room temperature for 1 h then filtered to give a wet paste which was dried under high vacuum at 100° C. overnight. Used directly in the next step without purification.

Step 2: 4-[5-amino-6-[5-(6-amino-2-pyridyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

To a suspension of 4-[5-amino-6-[[(6-aminopyridine-2-carbonyl)amino]carbamoyl]pyrazin-2-yl]-N,N-dimethyl-benzamide (80 mg, 0.1903 mmol) in anhydrous acetonitrile (1.600 mL) cooled in an ice bath, was added DIPEA (73.78 mg, 99.43 μL, 0.5709 mmol) followed by dibromo(triphenyl)phosphorane (104.4 mg, 0.2474 mmol) portionwise. The resulting mixture was stirred at room temperature for 30 min. The precipitate was isolated by filtration, washed with small amount of acetonitrile giving a pale yellow solid. The solid was triturated in hot acetonitrile, cooled, filtered and washed acetonitrile then ether to give the pure product (36.1 mg, 54% yield); 1H NMR (400 MHz, DMSO) δ 2.98-3.02 (m, 6H), 6.53 (br s, 2H), 6.69 (m, 1.5H), 7.16 (m, 0.5H), 7.16 (m, 1H), 7.53-7.66 (m, 3H), 8.11 (m, 2H) and 8.94 (s, 1H) ppm; MS (ES⁺) 403.29

The following compounds were all prepared using a method similar to the one described for Compound IA-231 above.

Compound IA-73: tert-butyl N-[[3-[5-[3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl]carbamate 1H NMR (400.0 MHz, DMSO) δ 1.41 (s, 9H), 2.98 (m, 6H), 4.27 (m, 2H), 7.54-7.60 (m, 4H), 7.65 (m, 1H), 7.79 (br s, 2H), 8.03-8.05 (m, 2H), 8.16 (m, 2H) and 8.99 (s, 1H) ppm; MS (ES⁺) 516.3

Compound IA-95: tert-butyl 4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-3,6-dihydro-2H-pyridine-1-carboxylate 1H NMR (400 MHz, DMSO) δ 1.19 (d, 6H), 1.45 (s, 9H), 2.64 (s, 2H), 3.39-3.53 (m, 1H), 3.60 (s, 2H), 4.18 (s, 2H), 7.01 (s, 1H), 7.85 (s, 2H), 7.95 (d, 2H), 8.36 (d, 2H) and 9.05 (s, 1H) ppm; MS (ES⁺) 527.3

Compound IA-143: 5-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]thiophene-3-carbonitrile 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 3.47 (t, 1H), 7.97 (d, 2H), 8.40 (dd, 2H), 8.46 (d, 1H), 8.97 (d, 1H) and 9.08 (s, 1H) ppm; MS (ES⁺) 453.0

Compound IA-154: tert-butyl N-[l 1-[3-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]ethyl]carbamate 1H NMR (400 MHz, DMSO) δ 1.19 (m, 6H), 1.38 (m, 12H), 3.48 (m, 1H), 4.77 (m, 1H), 7.64 (m, 3H), 7.97 (m, 2H), 8.03 (m, 1H), 8.10 (s, 1H), 8.39 (m, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 565.35

Compound IA-162: tert-butyl N-[[4-[5-[3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl]carbamate 1H NMR (400.0 MHz, DMSO) δ 1.42 (s, 9H), 2.98-3.02 (m, 6H), 4.25 (d, 2H), 7.51-7.56 (m, 5H), 7.79 (br s, 2H), 8.12-8.19 (m, 4H) and 8.98 (s, 1H) ppm; MS (ES⁺) 516.24

Compound IA-223: 4-[5-amino-6-[5-(2-amino-4-pyridyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400 MHz, DMSO) δ 2.98-3.02 (m, 6H), 6.49 (br s, 2H), 7.13-7.17 (m, 2H), 7.54-7.56 (m, 2H), 7.80 (br s, 2H), 8.14-8.19 (m, 3H) and 9.00 (1H, s) ppm; MS (ES⁺) 403.21

Compound IA-251: tert-butyl N-[2-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]ethyl]carbamate 1H NMR (400 MHz, DMSO) δ 1.19 (d, 6H), 1.32 (s, 9H), 2.08 (s, 2H), 3.13 (s, 2H), 3.31 (d, 2H), 3.40 (d, 1H), 7.05-7.08 (m, 1H), 7.96 (d, 2H), 8.32 (d, 2H) and 9.02 (s, 1H) ppm; MS (ES⁺) 489.27

Example 27A: 4-(5-amino-6-(5-(2-ethylphenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide (Compound IA-155)

Compound IA-155 was prepared using Method IV-B, Steps 1-2, followed by Method IV-L, Step 1, followed by Method IV-O, Step 1, followed by Method IV-Y, Step 1.

Method IV-Y Step 1: 4-(5-amino-6-(5-(2-ethylphenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide

A suspension of 4-[5-amino-6-[5-(2-vinylphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (45 mg, 0.1091 mmol) in a mixture of ethanol (5 mL) and acetic acid (0.5 mL) in the presence of Pd on C, wet, Degussa (116.1 mg, 0.1091 mmol) was hydrogenated at 60 psi overnight using the parr apparatus. The reaction mixture was filtered through a Celite pad and washed with more ethanol (5 mL) and ethyl acetate (5 mL). The filtrate was dried over MgSO₄ and filtered and concentrated in vacuo. Purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were combined and freeze dried to give the product as a yellow solid (14.2 mg, 38% yield); 1H NMR (400 MHz, DMSO) δ 1.30 (t, 3H), 2.98 (m, 6H), 3.13 (q, 2H), 7.48-7.55 (m, 4H), 7.62 (m, 1H), 7.78 (br s, 2H), 8.05 (m, 1H), 8.14 (m, 2H) and 8.99 (1H, s) ppm; MS (ES⁺) 415.27

Example 28A: 4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N,N-dimethyl-3-prop-1-ynyl-benzamide (Compound IA-268)

Compound IA-268 was prepared using Method IV-A, Steps 1-2, followed by Method IV-N, Step 1, followed by Method IV-Z, Steps 1-2.

Method IV-Z Step 1: di-tert-butyl(5-(4-(dimethylcarbamoyl)-2-(prop-1-ynyl)phenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)iminodicarbonate

4-(dimethylcarbamoyl)-2-(prop-1-ynyl)phenylboronic acid (52 mg, 0.225 mmol) was treated with tert-butyl N-[5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (77.91 mg, 0.1503 mmol), sodium carbonate (75.15 μL of 2 M, 0.1503 mmol) and dichloropalladium; triphenylphosphane (10.55 mg, 0.01503 mmol) and DMF (1.122 mL), and the resulting mixture heated at 95° C. in the microwave for 1 h. The reaction mixture was diluted with EtOAc and washed NaHCO₃/NaCl aqueous solution (3×5 mL), dried over MgSO4 and concentrated in vacuo. Purified by column chromatography on silica gel eluting with 30-100% EtOAc/petroleum ether. Product fractions were combined and concentrated in vacuo to leave a brown oil which was used directly in the next step.

Step 2: 4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N,N-dimethyl-3-prop-1-ynyl-benzamide

di-tert-butyl(5-(4-(dimethylcarbamoyl)-2-(prop-1-ynyl)phenyl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)iminodicarbonate (10 mg, 0.01601 mmol) in CH₂Cl₂ (200 μL) was treated with TFA (200 μL, 2.596 mmol) and stirred at room temperature for 1 h. The reaction mixture was concentrated under reduced pressure then passed through carbonate cartridge with eluting with DCM/MeOH. The product was purified by column chromatography on silica gel eluting with 20-100% EtOAc/CH₂Cl₂ to yield the product (2.6 mg, 34% yield); 1H NMR (400 MHz, CDCl₃) δ 1.97 (s, 3H), 2.98-3.07 (m, 6H), 7.40-7.52 (m, 5H), 7.82 (m, 1H), 8.19 (m, 2H) and 8.90 (s, 1H) ppm; MS (ES⁺) 425.21

Example 29A: 4-[5-amino-6-[5-[3-(aminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-183)

Compound IA-183 was prepared using Method IV-B, Steps 1-4, followed by Method IV-AA, Step 1.

Method IV-AA Step 1: 4-[5-amino-6-[5-[3-(aminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

TFA (131.1 mg, 88.58 μL, 1.150 mmol) was added to a solution of tert-butyl N-[[3-[5-[3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl]carbamate (60 mg, 0.1150 mmol) in dichloromethane (2 mL) and the resulting solution stirred at room temperature overnight. The reaction mixture was passed through a bicarbonate cartridge, which was flushed further with methanol (5 mL). The filtrate was concentrated in vacuo to leave a yellow/orange solid. The solid was taken up in a mixture of methanol and dichloromethane and passed through an SCX cartridge. The cartridge was washed initially with methanol and then the product eluted with 2M ammonia in methanol solution over 4 fractions. A yellow solid crystallised out of the filtrate which was isolated by filtration to give the product (44 mg, 90% yield) 1H NMR (400 MHz, DMSO) δ 2.98 (m, 6H), 3.87 (s, 2H), 7.55 (m, 2H), 7.59-7.66 (m, 2H), 7.81 (br s, 2H), 8.00 (m, 1H), 8.17 (m, 3H) and 8.99 (s, 1H) ppm; MS (ES⁺) 416.26

The following compounds were all prepared using a method similar to the one described for Compound IA-183 above.

Compound IA-234: 4-[5-amino-6-[5-[4-(aminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400 MHz, DMSO) δ 2.99-3.02 (m, 6H), 4.20 (s, 2H), 7.56 (d, 2H), 7.75 (d, 2H), 7.80 (br s, 2H), 8.18 (d, 2H), 8.23 (d, 2H), 8.34 (br s, 2H) and 9.00 (s, 1H) ppm; MS (ES⁺) 416.25

Example 30A: 4-[5-amino-6-[5-[2-(2-aminoethoxy)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-213)

Compound IA-213 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AB, Step 1.

Method IV-AB Step 1: 4-[5-amino-6-[5-[2-(2-aminoethoxy)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

A mixture of 4-[5-amino-6-[5-(2-hydroxyphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (50 mg, 0.1228 mmol) in DMF (1.000 mL) was stirred at room temperature and potassium carbonate (25.46 mg, 0.1842 mmol) added. The resulting suspension was heated at 60-65° C. and tert-butyl N-(2-bromoethyl)carbamate (30.28 mg, 0.1351 mmol) was added slowly. After addition is complete the reaction mixture was heated overnight at 65° C. The reaction mixture was cooled to room temperature and water (2 mL) added slowly and the mixture stirred at room temperature for 20 min. A precipitate formed and was isolated by filtration and washed with water (3×5 mL). The solid was re-dissolved in CH₂Cl₂ and dried (MgSO4), filtered and evaporated to dryness. The solid was triturated with DCM/Ether, and filtered to leave a yellow solid. The yellow solid was in CH₂Cl₂ (1 mL) and TFA (150 μL, 1.947 mmol) added and the resulting solution stirred at room temperature for 2 h. The reaction mixture was concentrated in vacuo and the residue taken up in a mixture of MeOH/CH₂Cl₂ (4 mL) and passed through a bicarbonate cartridge eluting with MeOH/DCM. The filtrate was evaporated to dryness and then triturated with acetonitrile to give the product as a yellow solid (36.7 mg, 69% yield) 1H NMR (400 MHz, DMSO) δ 2.98 (s, 3H), 3.02 (s, 3H), 3.31 (t, 2H), 4.41 (t, 2H), 7.30 (t, 1H), 7.40 (d, 1H), 7.56 (d, 2H), 7.69-7.71 (m, 2H), 7.87 (s, 3H), 8.04 (dd, 1H), 8.16 (d, 2H) and 9.01 (s, 1H) ppm; MS (ES⁺) 446.28

Example 31A: 4-(5-amino-6-(5-(3-methoxythiophen-2-yl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide (Compound IA-172)

Compound IA-172 was prepared using Method IV-C, Steps 1-2, followed by Method IV-AC, Step 1.

Method IV-AC Step 1: 4-(5-amino-6-(5-(3-methoxythiophen-2-yl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-N,N-dimethylbenzamide

TBTU (160.4 mg, 0.4995 mmol) and Et₃N (33.70 mg, 46.42 μL, 0.3330 mmol) were added to a solution of 4-(5-amino-6-(hydrazinecarbonyl)pyrazin-2-yl)-N,N-dimethylbenzamide (100 mg, 0.3330 mmol) and 3-methoxythiophene-2-carboxylic acid (52.67 mg, 0.3330 mmol) in CH₂Cl₂ (2.000 mL) and the resulting solution stirred at room temperature for 72 h. The reaction mixture was diluted with dichloromethane (5 mL) and water (5 mL) and the layers separated. The aqueous layer was extracted further with dichloromethane (3×5 mL), and the combined organic extracts dried over MgSO₄, filtered and concentrated in vacuo to leave 4-[5-amino-6-[[(3-methoxythiophene-2-carbonyl)amino]carbamoyl]pyrazin-2-yl]-N,N-dimethyl-benzamide as a yellow oil. POCl₃ (1.788 g, 1.087 mL, 11.66 mmol) was added to 4-[5-amino-6-[[(3-methoxythiophene-2-carbonyl)amino]carbamoyl]pyrazin-2-yl]-N,N-dimethyl-benzamide and the resulting mixture heated at 100° C. for 2 h. The reaction mixture was cooled to room temperature and ice/water added carefully with vigorous stirring between additions. The mixture was left to stir at room temperature for 20 min and then diluted with dichloromethane (10 mL) and the layers separated. The aqueous layer was extracted further with dichloromethane (2×5 mL) and combined organics dried over MgSO₄ and concentrated in vacuo. Solid obtained is re-dissolved in CH₂Cl₂ and purified by column chromatography on the ISCO column companion system (12 g column, 0-5% MeOH/CH₂Cl₂). Product fractions were combined and concentrated in vacuo. This was purified further by reverse phase preparative HPLC [Waters Sunfire C18, 10 mM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were combined and freeze dried to give the product as a yellow solid (33.0 mg, 23% yield) 1H NMR (400 MHz, DMSO) δ 2.98 (s, 3H), 3.01 (s, 3H), 4.07 (s, 3H), 7.30 (d, 1H), 7.56 (d, 2H), 7.70 (br s, 2H), 7.96 (d, 1H), 8.14 (d, 2H) and 8.97 (s, 1H) ppm; MS (ES⁺) 423.19

Example 31A: 2-(5-amino-6-(5-(3-methylthiophen-2-yl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-5-(1,4-diazepane-1-carbonyl)benzonitrile (Compound IA-181)

Compound IA-181 was prepared using Method IV-AD, Steps 1-5.

Method IV-AD Step 1: 3-amino-6-bromo-N-(3-methylthiophene-2-carbonyl)pyrazine-2-carbohydrazide

To a suspension of 3-amino-6-bromo-pyrazine-2-carboxylic acid (13.26 g, 60.82 mmol) and 3-methylthiophene-2-carbohydrazide (10 g, 60.82 mmol) in DMF (95.00 mL) cooled in an ice bath was added Et₃N (7.385 g, 10.17 mL, 72.98 mmol) followed by TBTU (23.43 g, 72.98 mmol) portionwise after complete addition, the reaction mixture was allowed to warm to room temperature and stirred overnight. The reaction mixture was diluted with EtOAc (50 mL) and water (50 mL). The layers were separated and the organic extracts washed with water (1×50 mL) and brine (1×50 mL), dried over MgSO₄ and concentrated to leave a brown solid (7.85 g, 36% yield) which was used directly in the next step without further purification.

Step 2: 5-bromo-3-(5-(3-methylthiophen-2-yl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

To a suspension of 3-amino-6-bromo-N′-(3-methylthiophene-2-carbonyl)pyrazine-2-carbohydrazide (7.85 g, 22.04 mmol) in anhydrous acetonitrile (117.8 mL) cooled in an ice bath was added DIPEA (8.546 g, 11.52 mL, 66.12 mmol) followed by dibromo(triphenyl)phosphorane (12.09 g, 28.65 mmol) portionwise. The resulting suspension was stirred at room temperature for 30 min and the precipitate isolated by filtration and washed with acetonitrile to give the product as a yellow solid (4.42 g, 52% yield); 1H NMR (400 MHz, DMSO) δ 2.64 (s, 3H), 7.21 (d, 1H), 7.91 (3H, m) and 8.44 (s, 1H) ppm; MS (ES⁺) 340.04

Step 3: tert-butyl-5-bromo-3-(5-(3-methylthiophen-2-yl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl(tert-butoxycarbonyl)carbamate

5-bromo-3-[5-(3-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (10.68 g, 31.58 mmol) and DMAP (385.8 mg, 3.158 mmol) were suspended in CH₂Cl₂ (160.2 mL) and THF (160.2 mL) and cooled in an icebath. tert-Butoxycarbonyl tert-butyl carbonate (20.68 g, 94.74 mmol) was added portionwise to the stirred mixture. The reaction mixture was stirred at room temperature for 1 h and then diluted with CH₂Cl₂ (100 ml) and saturated aqueous sodium hydrogen carbonate solution (100 ml). The layers were separated and the organic layer washed with saturated aqueous sodium hydrogen carbonate solution (2×100 ml), dried over MgSO₄, filtered and concentrated in vacuo. The residue was recrystallised from a mixture of ethyl acetate and petroleum ether to give the product as a brown crystalline material (14.29 g, 84% yield); 1H NMR (400 MHz, DMSO) δ 1.41 (s, 9H), 2.72 (s, 3H), 7.10 (m, 1H), 7.55 (m, 1H) and 8.74 (s, 1H) ppm

Step 4: tert-butyl 4-(4-(5-(bis(tert-butoxycarbonyl)amino)-6-(5-(3-methylthiophen-2-yl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)-3-cyanophenylcarbonyl)-1,4-diazepane-1-carboxylate

tert-Butyl N-[5-bromo-3-[5-(3-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (13.52 g, 25.12 mmol) and tert-butyl 4-[3-cyano-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoyl]-1,4-diazepane-1-carboxylate (11.44 g, 25.12 mmol) were taken up in DMF (160 mL) and Na₂CO₃ (37.68 mL of 2 M, 75.36 mmol) (4:1 mixture) and reaction mixture degassed with nitrogen and Pd (tBu₃P)₂ (1.027 g, 2.010 mmol) added in one portion. The resulting mixture was heated at 75° C. 2.5 h. The reaction mixture was cooled to room temperature and diluted with EtOAc (50 mL) and water (50 mL). The organic extracts were washed with water (1×100 mL) and brine (1×100 mL) and then the aqueous layers back extracted with ethyl acetate (3×100 mL), dried over MgSO₄, filtered and concentrated in vacuo. The material was passed through a silica pad eluting with 50-100% EtOAc/Petroleum ether. The material was purified further by column chromatography on silica (500 mL) eluting with 30-100% EtOAc/petroleum ether. Product fractions were combined and concentrated in vacuo to leave the product as a yellow solid (11.9 g, 55% yield)

Step 5: 2-[5-amino-6-[5-(3-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-5-(1,4-diazepane-1-carbonyl)benzonitrile

tert-Butyl 4-[4-[5-[bis(tert-butoxycarbonyl)amino]-6-[5-(3-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-3-cyano-benzoyl]-1,4-diazepane-1-carboxylate (9.9 g, 11.32 mmol) was dissolved in anhydrous CH₂Cl₂ (100 mL) at room temperature and TFA (10 mL, 129.8 mmol) added. Additional TFA (10 mL, 129.8 mmol) was added and the reaction mixture stirred at room temperature for 3.5 h and then concentrated in vacuo. The material was dissolved in a mixture of acetonitrile and methanol (10; 1 mixture) and PS-HCO₃ (5 eq) added. The mixture was stirred for 1 h at room temperature and then the resin removed by filtration and washed with acetonitrile and methanol. The filtrate was concentrated in vacuo and the residue recrystallised from acetonitrile. The isolated solid was washed with ether and dried to give the product as a yellow solid (2.41 g, 35% yield); 1H NMR (400 MHz, DMSO) δ 1.76-1.84 (m, 2H), 2.67 (s, 3H), 2.88-2.93 (m, 4H), 3.42-3.44 (m, 2H), 3.67-3.74 (m, 2H), 7.2 (d, 1H), 7.84-7.87 (m, 1H), 7.89-7.99 (m, 1H), 8.04-8.09 (m, 2H) and 8.85 (s, 1H) ppm; MS (ES⁺) 487.26

Example 32A: 1-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]pyrrole-2-carbonitrile (Compound IA-264)

Compound IA-264 was prepared using Method IV-A, Steps 1-2, followed by Method IV-N, Step 1, followed by Method IV-AE, Step 1.

Method IV-AE Step 1: 1-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]pyrrole-2-carbonitrile

tert-Butyl N-[5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (100 mg, 0.1929 mmol) and cesium carbonate (125.7 mg, 0.3858 mmol) were added to DMF (5 mL) followed by the addition of 1H-pyrrole-2-carbonitrile (26.65 mg, 0.2894 mmol). The resulting mixture was heated at 50° C. for 1 h. The mixture was cooled to room temperature, filtered and diluted with ethyl acetate (5 mL). The organics were washed with water (1×10 mL) and brine (1×10 mL) and the organic layer concentrated in vacuo to leave an oil. This was dissolved in CH₂Cl₂ (10 mL) and TFA (659.9 mg, 445.9 μL, 5.787 mmol) was added. The reaction mixture was stirred at room temperature for 1 h, and then concentrated in vacuo to an oil. The oil was dissolved in CH₂Cl₂ and the product precipitated by slow addition of petroleum ether (28.3 mg, 45% yield); 1H NMR (400 MHz, DMSO) δ 6.6 (s, 1H), 7.3 (s, 1H), 7.7-7.85 (m, 3H), 7.9 (br s, 2H), 7.95 (s, 1H), 8.2-8.25 (m, 2H) and 8.8 (s, 1H) ppm; MS (ES⁺) 330.2

Example 33A: 4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-2-(2-dimethylaminoethylamino)pyridine-3-carbonitrile (Compound IA-209)

Compound IA-209 was prepared using Method IV-A, Steps 1-2, followed by Method IV-N, Step 1, followed by Method IV-Q, Step 1, followed by Method IV-AF, Step 1.

Method IV-AF Step 1: 4-[5-amino-6-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yl]-2-(2-dimethylaminoethylamino)pyridine-3-carbonitrile

N,N-dimethylethane-1,2-diamine (22.04 mg, 27.45 μL, 0.2500 mmol) was added to a solution of di-tert-butyl 5-(2-chloro-3-cyanopyridin-4-yl)-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-yliminodicarbonate (36 mg, 0.06250 mmol) and Et₃N (25.30 mg, 34.85 μL, 0.2500 mmol) in NMP (1 mL) and the reaction was heated at 150° C. for 2 hours under microwave conditions. The material was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were collected and freeze-dried to give the title compound as a yellow solid (7.6 mg, 24% yield); 1H NMR (400 MHz, DMSO) δ 2.88 (d, 6H), 3.38 (br m, 2H), 3.81-3.83 (m, 2H), 7.34 (d, 1H), 7.63-7.71 (m, 3H), 8.22-8.24 (m, 2H), 8.38 (d, 1H), 8.96 (s, 1H) and 9.23 (br s, 1H) ppm; MS (ES⁺) 428.3

Example 34A: 4-[5-amino-6-[5-[3-(hydroxymethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-198)

Compound IA-198 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AG, Step 1.

Method IV-AG Step 1: 4-[5-amino-6-[5-[3-(hydroxymethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

Diisobutylaluminium hydride (810.0 μL of 1 M, 0.8100 mmol) in dichloromethane was added dropwise to a solution of methyl 3-[5-[3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]benzoate (120 mg, 0.2700 mmol) in CH₂Cl₂ (6 mL) at 0° C., the solution darkened upon addition. The resulting solution was stirred at 0° C. for 30 min and allowed to warm slowly to room temperature. The reaction mixture was stirred at room temperature for 4 h and then quenched by addition of 1M HCl (3 mL). The resulting mixture was filtered through a Celite pad and washed with dichloromethane (2×5 mL). The layers were separated and the aqueous layer extracted further with dichloromethane (2×10 mL) and combined organic extracts dried over MgSO4 and concentrated in vacuo. The residue was purified using by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH3CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lyopholised to give the product as a yellow solid (20.3 mg, 18% yield); 1H NMR (400 MHz, DMSO) δ 2.98 (m, 6H), 4.66 (s, 2H), 7.55 (m, 2H), 7.63 (m, 2H), 7.80 (br s, 2H), 8.04 (m, 1H), 8.16 (m, 3H) and 8.99 (s, 1H) ppm; MS (ES⁺) 417.23

Example 35A: 4-[5-amino-6-[5-[3-(2-hydroxyethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-69)

Compound IA-69 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AH, Step 1.

Method IV-AH Step 1: 4-[5-amino-6-[5-[3-(2-hydroxyethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

To a solution of 4-[5-amino-6-[5-(3-vinylphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (100 mg, 0.2425 mmol) in THF (9.172 mL) at 0° C., borane-THF complex (606.3 μL of 1 M, 0.6063 mmol) was added dropwise and the reaction mixture stirred overnight at room temperature. Water (43.69 mg, 43.69 μL, 2.425 mmol) was added to the reaction mixture followed by hydrogen peroxide (299.9 μL of 27.5% w/v, 2.425 mmol) and NaOH (606.5 μL of 2 M, 1.213 mmol) and the mixture stirred vigorously for 1 h. The mixture was partitioned between ethyl acetate (5 mL) and water (5 mL) and the layers separated. The aqueous layer was extracted further with ethyl acetate (2×5 mL) and combined organic extracts dried over MgSO₄ and concentrated in vacuo. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH3CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lyopholised to give the product as a yellow solid (5.8 mg, 11% yield); 1H NMR (400 MHz, DMSO) δ 2.89 (t, 2H), 2.98 (m, 6H), 3.70 (q, 2H), 4.75 (t, 1H), 7.55-7.62 (m, 4H), 7.80 (br s, 2H), 8.01 (m, 2H), 8.17 (m, 2H) and 8.99 (s, 1H) ppm; MS (ES⁺) 431.24

The following compounds were all prepared using a method similar to the one described for Compound IA-69 above.

Compound IA-275: 4-[5-amino-6-[5-[3-(1-hydroxyethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide 1H NMR (400 MHz, DMSO) δ 1.40 (d, 3H), 2.98 (m, 6H), 4.88 (m, 1H), 5.46 (m, 1H), 7.55 (m, 2H), 7.62 (m, 2H), 7.81 (br s, 2H), 8.03 (m, 1H), 8.16 (m, 3H) and 8.99 (s, 1H) ppm; MS (ES⁺) 431.24

Example 36A: 4-[5-amino-6-[5-[2-(3-thienyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-127)

Compound IA-127 was prepared using Method IV-B, Steps 1-2, followed by Method IV-L, Step 1, followed by Method IV-AI, Step 1.

Method IV-AI Step 1: 4-[5-amino-6-[5-[2-(3-thienyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

A solution of 4-[5-amino-6-[5-(2-bromophenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (50 mg, 0.108 mmol), thiophen-3-ylboronic acid (13.8 mg, 0.108 mmol), cesium carbonate (107 μL of 2M aqueous solution) and dichloropalladium; triphenylphosphane (7.55 mg, 0.0108 mmol) in dioxane (2 mL) was heated at 110° C. in the microwave for 1 h. The reaction mixture was cooled to room temperature and filtered. The filtrated was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH3CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lyopholised to give the product as a yellow solid (7.4 mg, 17% yield); 1H NMR (400 MHz, DMSO) δ 2.97 (m, 6H), 7.09 (m, 1H), 7.53 (m, 2H), 7.60 (m, 2H), 7.64 (m, 2H), 7.71-7.76 (m, 3H), 8.01 (m, 2H), 8.07 (m, 1H) and 8.95 (s, 1H) ppm; MS (ES⁺) 469.22

Example 37A: 3-[5-[3-(aminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine (Compound IA-220)

Compound IA-220 was prepared using Method IV-AJ, Steps 1-4.

Method IV-AJ Step 1: 3-amino-6-bromopyrazine-2-carbohydrazide

Methyl 3-amino-6-bromo-pyrazine-2-carboxylate (10.18 g, 43.87 mmol) was suspended in EtOH (50.90 mL) and hydrazine hydrate (4.392 g, 4.268 mL, 87.74 mmol) was added and the reaction mixture heated at 70° C. for 2 h. Water (50 mL) was added and the precipitate isolated by filtration. The solid was washed with methanol and dried under vacuum to leave the product as a pale yellow powder (9.8 g, 96% yield); 1H NMR (400 MHz, DMSO) δ 4.53 (bs s, 2H), 7.62 (br s, 2H) and 9.78 (br s, 1H) ppm; MS (ES⁺) 232.06

Step 2: tert-butyl 3-(5-(3-amino-6-bromopyrazin-2-yl)-1,3,4-oxadiazol-2-yl)benzylcarbamate

3-amino-6-bromo-pyrazine-2-carbohydrazide (1.2 g, 5.172 mmol), TBTU (1.333 g, 5.689 mmol), 3-[(tert-butoxycarbonylamino)methyl]benzoic acid (1.300 g, 5.172 mmol) and DIPEA (1.338 g, 1.803 mL, 10.35 mmol) in a solution in DMF (13.98 mL) were stirred at room temperature for 1 h. The reaction mixture was diluted with ethyl acetate (35 mL), washed with water (2×50 mL) and brine (1×50 mL). The organic layer was dried over MgSO4 and concentrated in vacuo to a solid. This solid was suspended in MeCN (83.89 mL) at room temperature followed by the addition of dibromo(triphenyl)phosphorane (2.183 g, 5.172 mmol) and DIPEA (1.338 g, 1.803 mL, 10.35 mmol). The resulting mixture was stirred at room temperature for 2 h and then concentrated in vacuo to leave a solid. This was purified by column chromatography on silica eluting with EtOAc/petroleum ether, Product fractions were combined and concentrated in vacuo to leave the product as a white solid. The mixture was conc. to a solid and purified by column chromatography using ethylacetate/pet ether as eluant to afford the product as a white solid (924 mg, 40% yield); 1H NMR (400 MHz, DMSO) δ 1.43 (s, 9H), 4.26 (m, 2H), 7.55 (m, 3H), 7.80 (br s, 2H), 7.97 (m, 1H) and 8.45 (s, 1H) ppm; MS (ES⁺) 449.08

Step 3: 3-[5-[3-(aminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl) pyrazin-2-amine

Sodium carbonate (335.4 μL of 2 M, 0.6708 mmol) was added to a solution of tert-butyl N-[[3-[5-(3-amino-6-bromo-pyrazin-2-yl)-1,3,4-oxadiazol-2-yl]phenyl]methyl]carbamate (100 mg, 0.2236 mmol), (4-isopropylsulfonylphenyl)boronic acid (66.30 mg, 0.2907 mmol), palladium; triphenylphosphane (25.84 mg, 0.02236 mmol) in dioxane (5 mL) and the resulting mixture heated at 110° C. under microwave conditions for 90 min. The mixture was placed directly onto silica gel pad and washed through with diethyl ether and followed by 50% EtOAc/petroleum ether. Product fractions were combined and concentrated in vacuo. The residue was dissolved in CH₂Cl₂ (10 mL) and TFA (764.9 mg, 516.8 μL, 6.708 mmol) was added. The reaction mixture was stirred at room temperature for 1 h and then concentrated in vacuo to leave an oil. This was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH3CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lyopholised to give the product as a yellow solid (36.05 mg, 35% yield); 1H NMR (400 MHz, DMSO) δ 1.3 (d, 6H), 3.45-3.55 (m, 1H), 4.24-4.3 (m, 2H), 7.7-7.8 (m, 2H), 7.95 (d, 2H), 8.25 (d, 1H), 8.3-8.4 (br s, 2H), 8.4 (s, 1H), 8.45 (d, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 451.2

The following compounds were all prepared using a method similar to the one described for Compound IA-220 above.

Compound IA-88: 3-[4-[5-amino-6-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]phenyl]sulfonylbutan-1-ol 1H NMR (400 MHz, DMSO) δ 1.21 (d, 3H), 1.38-1.47 (m, 1H), 1.97-2.05 (m, 1H), 2.64 (t, 3H), 3.38-3.46 (m, 2H), 3.51-3.56 (m, 1H), 4.29 (t, 2H), 7.77 (d, 2H), 7.97-8.01 (m, 2H), 8.26 (d, 2H), 8.40-8.44 (m, 2H), 8.97 (s, 2H) and 9.09 (d, 1H) ppm; MS (ES⁺) 495.0

Compound IA-257: 3-[5-[3-(aminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(2-methylsulfinylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 3.1 (s, 3H), 4.3 (s, 2H), 7.6-7.75 (m, 4H), 8.05 (d, 1H), 8.15 (d, 1H), 8.35-8.5 (m, 4H) and 8.9 (s, 1H) ppm; MS (ES⁺) 407.1

Compound IA-321: 5-(3-fluoro-4-isopropylsulfonyl-phenyl)-3-[5-[2-fluoro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.25 (d, 6H), 2.7 (s, 3H), 3.5-3.6 (m, 1H), 4.4 (s, 2H), 7.6 (d, 1H), 7.7 (d, 1H), 7.9 (t, 1H), 8.2-8.3 (m, 2H), 8.35 (t, 1H), 8.9-9.0 (br s, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 501.3

Compound IA-329: 5-(3-chloro-4-isopropylsulfonyl-phenyl)-3-[5-[2-fluoro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.25 (d, 6H), 2.7 (s, 3H), 3.7-3.8 (m, 1H), 4.4 (s, 2H), 7.6 (d, 1H), 7.7 (d, 1H), 8.1 (d, 1H), 8.25-8.35 (m, 2H), 8.4 (s, 1H), 8.9-9.0 (br s, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 517.2

Compound IA-342: 3-[4-[5-amino-6-[5-[2-fluoro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]phenyl]sulfonylbutan-1-ol 1H NMR (400 MHz, DMSO) δ 1.25 (d, 3H), 1.4-1.5 (m, 1H), 1.95-2.03 (m, 1H), 2.7 (s, 3H), 3.4-3.5 (m, 1H), 3.5-3.6 (m, 1H), 4.45 (s, 2H), 4.6-4.7 (m, 1H), 7.6 (d, 1H), 7.7 (d, 1H), 8.0 (d, 2H), 8.3 (t, 1H), 8.4 (d, 2H), 9.0 (br s, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 513.2

Example 38A: 3-[5-[3-(dimethylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine (Compound IA-204)

Compound IA-204 was prepared using Method IV-AJ, Steps 1-3, followed by Method IV-AK, Step 1.

Method IV-AK Step 1: 3-[5-[3-(dimethylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine

3-[5-[3-(aminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine (12 mg, 0.02108 mmol) was added to a solution of MeI (8.976 mg, 3.937 μL, 0.06324 mmol) and potassium carbonate (8.740 mg, 0.06324 mmol) in DMF (2 mL). The resulting mixture was stirred at room temperature for 30 min. The reaction mixture was diluted with ethyl acetate (3 mL) and washed successively with water (1×5 mL) and brine (1×5 mL). The organic extracts were dried over MgSO₄ and concentrated in vacuo. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lyopholised to give the product as a yellow solid (3.0 mg, 24% yield); 1H NMR (400 MHz, MeOD) δ 1.35-1.4 (m, 6H), 2.95 (s, 6H), 4.65 (s, 2H), 7.8-7.85 (m, 2H), 8.05-8.1 (m, 2H), 8.4-8.5 (m, 4H) and 9.95 (s, 1H) ppm; MS (ES⁺) 479.3

Example 39A: 5-(4-isopropylsulfonylphenyl)-3-[5-(3-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (Compound IA-276)

Compound IA-276 was prepared using Method IV-AJ, Steps 1-3, followed by Method IV-AL, Step 1.

Method IV-AL Step 1: 5-(4-isopropylsulfonylphenyl)-3-[5-(3-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine

A microwave vial was charged with 5-bromo-3-[5-(3-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (75 mg, 0.2218 mmol), (4-isopropylsulfonylphenyl)boronic acid (50.59 mg, 0.2218 mmol), palladium; triphenylphosphane (12.82 mg, 0.01109 mmol) and an aqueous sodium carbonate (332.7 μL of 2 M, 0.6654 mmol) solution was then added followed by DMF (1 mL) and the vial sealed. The reaction mixture was heated in the microwave at 150° C. for 30 min. After this time water was added and the resulting precipitate collected by filtration. The precipitate was passed through a palladium scavenging column eluting with MeCN and MeOH. The solvent was removed to give the product as a yellow solid (19.2 mg, 19% yield); 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 2.69 (s, 3H), 3.48 (t, 1H), 7.23 (d, 1H), 7.92 (d, 2H), 7.98 (d, 2H), 8.36-8.34 (m, 2H) and 9.06 (s, 1H) ppm; MS (ES⁺) 442.0

The following compounds were all prepared using a method similar to the one described for Compound IA-276 above.

Compound IA-269: 5-[4-(2-dimethylaminoethylsulfonyl)phenyl]-3-[5-(3-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 2.69 (s, 3H), 2.78 (s, 6H), 3.36 (s, 2H), 3.91-3.87 (m, 2H), 7.23 (d, 1H), 7.93 (d, 1H), 8.07 (d, 2H), 8.39 (d, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 471.0

Example 40A: [4-[5-[3-amino-6-[4-(dimethylaminomethyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methanol (Compound IA-240)

Compound IA-240 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AM, Step 1.

Method IV-AM Step 1: [4-[5-[3-amino-6-[4-(dimethylaminomethyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methanol

Methyl 4-[5-[3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]benzoate (154 mg, 0.3465 mmol) in dry THF (1.5 mL) was cooled in ice-bath then treated dropwise with DIBAL (346.5 μL of 1 M solution in hexanes, 0.3465 mmol). The resulting mixture was stirred 0-20° C. over 90 min and then at room temperature overnight. Additional DIBAL (1.732 mL of 1 M solution in hexanes, 1.732 mmol) was added at room temperature. The reaction mixture was poured onto water (10 mL) and acidified with 2M HCl, adjusted to pH 10 with aq NaOH solution and extracted EtOAc (6×10 mL) to give an orange solid. This was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were combined and passed through a bicarbonate cartridge. The eluent was concentrated in vacuo and taken up in acetonitrile and water and lyopholised to leave the product as a yellow powder (13.1 mg, 33% yield); 1H NMR (400 MHz, DMSO) δ 2.18 (s, 6H), 4.64 (s, 2H), 5.43 (br s, 1H), 4.43-4.45 (m, 2H), 7.65-7.63 (m, 2H), 7.69 (br s, 2H), 8.05-8.30 (m, 4H) and 8.92 (s, 1H) ppm; MS (ES⁺) 403.18

Example 41A: 4-[5-amino-6-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-281)

Compound IA-281 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AN, Step 1.

Method IV-AN Step 1: 4-[5-amino-6-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

4-[5-amino-6-[5-[4-(bromomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (70 mg, 0.1460 mmol) was treated with methylamine (2 mL of 33% w/w solution in ethanol), and the resulting mixture stirred heated at 100° C. for 10 min. The reaction mixture was cooled to room temperature and filtered. The filtrate was collected and purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were passed through a carbonate cartridge eluting with MeOH/CH₂Cl₂. The eluent was concentrated in vacuo and the solid triturated with acetonitrile to give the product as a yellow solid (11.4 mg, 19% yield); 1H NMR (400 MHz, DMSO) δ 2.30 (s, 3H), 2.98-3.02 (m, 6H), 3.77 (s, 2H), 7.55 (d, 2H), 7.61 (d, 2H), 7.78 (br s, 2H), 8.11 (d, 2H), 8.17 (d, 2H) and 8.98 (s, 1H) ppm; MS (ES⁺) 430.31

Example 42A: [4-[5-[3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl acetate (Compound IA-131)

Compound IA-131 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AO, Step 1.

Method IV-AO Step 1: [4-[5-[3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl acetate

A mixture of 4-[5-amino-6-[5-[4-(bromomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (200 mg, 0.4172 mmol) and potassium acetate (102.4 mg, 1.043 mmol) in DMF (5.714 mL) was heated at 100° C. for 4 h in a sealed microwave tube. The reaction mixture was cooled to room temperature and poured onto ice/water and acidified by HCl (1.043 mL of 1 M, 1.043 mmol). The mixture was extracted with ethyl acetate (3×10 mL) and the combined organic extracts washed with brine (3×10 mL). The extracts were dried over MgSO₄ and concentrated under reduced pressure to give a yellow solid (150 mg, 74% yield); 1H NMR (400 MHz, DMSO) δ 2.13 (s, 3H), 2.98-3.02 (m, 6H), 5.22 (s, 2H), 7.55 (d, 2H), 7.66 (d, 2H), 7.78 (br s, 2H), 8.16-8.19 (m, 4H) and 8.99 (s, 1H) ppm; MS (ES⁺) 459.18

Example 43A: 4-[5-amino-6-[5-[4-(hydroxymethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-76)

Compound IA-76 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AO, Step 1, followed by Method IV-AP, Step 1.

Method IV-AP Step 1: 4-[5-amino-6-[5-[4-(hydroxymethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

[4-[5-[3-amino-6-[4-(dimethylcarbamoyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl acetate (118 mg, 0.2445 mmol) was suspended in methanol (2 mL) and treated with NaOH (489.0 μL of 1 M, 0.4890 mmol). The resulting mixture was stirred at 55° C. for 1 h. The reaction mixture was cooled to room temperature and then neutralised with HCl (978.0 μL of 1 M, 0.9780 mmol), filtered and washed with acetonitrile. The resulting yellow powder was heated in acetonitrile (5 mL), cooled and filtered to give a pale yellow powder. This was purified by column chromatography on silica gel eluting with 5% MeOH/CH₂Cl₂ to give the product as a pale yellow powder (73 mg, 70%); 1H NMR (400 MHz, DMSO) δ 2.98-3.02 (m, 6H), 4.64 (d, 2H), 5.44 (t, 1H), 7.54-7.62 (dd, 4H), 7.78 (br s, 2H), 8.12-8.18 (dd, 4H) and 8.98 (s, 1H) ppm; MS (ES⁺) 417.23

Example 44A: 4-[5-amino-6-[5-[4-(1,2-dihydroxyethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IA-106)

Compound IA-106 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AQ, Step 1.

Method IV-AQ Step 1: 4-[5-amino-6-[5-[4-(1,2-dihydroxyethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide

AD-mix-Alpha (450 mg,) and methanesulfonamide (20.53 mg, 0.2158 mmol) in a mixture of t-butanol (2 mL)/water (2 mL) were stirred at room temperature until dissolved, then cooled to 0° C. and treated with 4-[5-amino-6-[5-(4-vinylphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (89 mg, 0.2158 mmol). The reaction mixture was stirred vigorously and warmed to room temperature overnight. A further portion of AD-mix (300 g) was added and the reaction mixture stirred overnight at room temperature to give complete conversion. The reaction mixture was treated with Na₂S₂O₃/NaCl solution and extracted into ethyl acetate (10 mL), dried over MgSO₄ and concentrated under reduced pressure to give a yellow solid. This was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lyopholised to give the product as a pale yellow powder (28.4 mg, 36% yield); 1H NMR (400 MHz, DMSO) δ 2.9-3.02 (m, 6H), 3.51 (m, 2H), 4.67 (m, 1H), 4.83 (m, 1H), 5.49 (m, 1H), 7.55 (d, 2H), 7.64 (d, 2H), 7.78 (br s, 2H), 8.11 (d, 2H), 8.18 (d, 2H) and 8.98 (s, 1H) ppm; MS (ES⁺) 447.25

Example 45A: 3-[5-[4-(aminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine (Compound IA-222)

Compound IA-222 was prepared using Method IV-C, Steps 1-2, followed by Method IV-AR, Steps 1-3.

Method IV-AR Step 1: tert-butyl 4-(2-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazine-2-carbonyl)hydrazinecarbonyl)benzylcarbamate

3-amino-6-(4-isopropylsulfonylphenyl)pyrazine-2-carbohydrazide (100 mg, 0.2833 mmol) and 4-[(tert-butoxycarbonylamino)methyl]benzoic acid (71.19 mg, 0.2833 mmol) in dmf (1.000 mL) was treated with triethylamine (28.67 mg, 39.49 μL, 0.2833 mmol) followed by TBTU (109.2 mg, 0.3400 mmol) and the resulting solution stirred at room temperature overnight. The solution was poured dropwise onto rapidly stirred water (15 ml), stirred at room temperature for 1 h and then filtered to give the product as a pale yellow solid which was dried under high vacuum at 83° C. and then used directly in the next step without further purification (136 mg, 84%)

Step 2: tert-butyl 4-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)benzylcarbamate

A mixture of tert-butyl 4-(2-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazine-2-carbonyl)hydrazinecarbonyl)benzylcarbamate(136 mg, 0.24 mmol) and DIPEA (109.8 mg, 148.0 μL, 0.8499 mmol) in acetonitrile (3.000 mL) at 0° C. was treated portionwise with dibromo(triphenyl)phosphorane (143.5 mg, 0.3400 mmol) and the resulting mixture stirred at room temperature for 48 h. The mixture was concentrated in vacuo and pre-absorbed onto silica gel and purified by column chromatography on silica gel eluting with 50% EtOAc/CH₂Cl₂ to give the product (46.8 mg, 30% yield); MS (ES⁺) 551.31

Step 3: 3-[5-[4-(aminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl) pyrazin-2-amine

A solution of tert-butyl N-[[4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl]carbamate (45 mg, 0.08172 mmol) in CH₂Cl₂ (1 mL) was treated with TFA (1 mL, 12.98 mmol) and stirred at room temperature for 1 h. The solution was concentrated under reduced pressure then azeotroped with methanol/CH₂Cl₂ (×2), dissolved in CH₂Cl₂/MeOH and passed through a carbonate cartridge. The eluent was concentrated then crystallised from hot acetonitrile giving a yellow crystalline solid (18 mg, 41% yield); 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 1.97 (br s, 2H), 3.47 (m, 1H), 3.85 (s, 2H), 7.63 (d, 2H), 7.89 (br s, 2H), 7.98 (d, 2H), 8.11 (d, 2H), 8.40 (d, 2H) and 9.06 (s, 1H) ppm; MS (ES⁺) 451.41

The following compounds were all prepared using a method similar to the one described for Compound IA-222 above.

Compound IA-80: 3-[5-[3-[(1R)-1-aminoethyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.19 (m, 6H), 1.32 (m, 3H), 3.48 (m, 1H), 4.17 (m, 1H), 7.61 (m, 1H), 7.69 (m, 1H), 7.99 (m, 5H), 8.19 (m, 1H), 8.39 (m, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 465.32

Compound IA-84: 5-(4-isopropylsulfonylphenyl)-3-[5-(3-pyrrolidin-2-ylphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.19 (m, 6H), 1.57 (m, 1H), 1.80 (m, 2H), 2.20 (m, 1H), 2.97 (m, 1H), 3.01 (m, 1H), 3.45 (m, 1H), 4.24 (m, 1H), 7.59 (m, 1H), 7.67 (m, 1H), 7.97-8.03 (m, 4H), 8.19 (s, 1H), 8.39 (m, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 491.33

Compound IA-91: 3-[5-(3-aminopropyl)-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.18-1.20 (m, 7H), 1.23 (s, 1H), 1.99 (t, 2H), 3.46 (t, 1H), 7.16 (s, 1H), 7.87 (d, 2H), 8.46 (d, 2H), 8.93 (s, 1H) and 10.20 (s, 1H) ppm; MS (ES⁺) 403.23

Compound IA-92: 3-[5-(4-aminobutyl)-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl) pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.18-1.20 (m, 7H), 1.50 (t, 2H), 1.84 (t, 2H), 2.62 (t, 2H), 3.03 (t, 3H), 3.46 (t, 1H), 7.85 (br s, 1H), 7.96 (d, 2H), 8.31 (d, 2H) and 9.02 (s, 1H) ppm; MS (ES⁺) 417.23

Compound IA-102: 5-(4-isopropylsulfonylphenyl)-3-[5-(4-pyrrolidin-2-ylphenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 1.45-1.58 (m, 1H), 1.71-1.86 (m, 2H), 2.15-2.26 (m, 1H), 2.90-3.08 (m, 2H), 3.48 (m, 1H), 4.18 (t, 1H), 7.65 (d, 2H), 7.97 (br s, 2H), 7.98 (d, 2H), 8.09 (d, 2H), 8.40 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 491.34

Compound IA-107: 3-[5-[4-(2-aminoethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 2.79 (m, 2H), 2.85 (m, 2H), 3.47 (m, 1H), 7.51 (d, 2H), 7.92 (br s, 2H), 7.98 (d, 2H), 8.09 (d, 2H), 8.39 (d, 2H) and 9.06 (s, 1H) ppm; MS (ES⁺) 465.34

Compound IA-123: 3-[5-[3-[(1S)-1-aminoethyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.19 (m, 6H), 1.32 (m, 3H), 3.49 (m, 1H), 4.18 (m, 1H), 7.61 (m, 1H), 7.69 (m, 1H), 7.99 (m, 4H), 8.19 (m, 1H), 8.39 (m, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 465.32

Compound IA-124: 3-[5-[4-[(1R)-1-aminoethyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 1.30 (d, 3H), 3.48 (m, 1H), 4.11 (q, 1H), 7.67 (d, 2H), 7.96 (v br s, 2H), 7.98 (d, 2H), 8.10 (d, 2H), 8.40 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 465.37

Compound IA-130: 3-[5-[2-fluoro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.3 (d, 6H), 2.7 (s, 3H), 3.4-3.6 (m, 1H), 4.35 (s, 2H), 7.6 (d, 1H), 7.7 (d, 1H), 8.0 (d, 2H), 8.3 (t, 1H), 8.38 (d, 2H), 8.92 (br s, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 483.4

Compound IA-145: 5-(4-isopropylsulfonylphenyl)-3-[5-(1,2,3,4-tetrahydroisoquinolin-6-yl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.19 (m, 6H), 2.89 (m, 2H), 3.08 (m, 2H), 3.47 (m, 1H), 4.03 (s, 1H), 7.34 (m, 1H), 7.90-7.99 (m, 5H), 8.26 (s, 1H), 8.38 (m, 2H) and 9.03 (s, 1H) ppm; MS (ES⁺) 477.41

Compound IA-147: 5-(4-isopropylsulfonylphenyl)-3-[5-(5-pyrrolidin-2-yl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.25 (d, 6H), 2.0-2.2 (m, 3H), 3.3-3.6 (m, 4H), 5.0-5.1 (m, 1H), 7.9-8.0 (m, 4H), 8.4 (d, 2H), 9.05-9.1 (m, 2H) and 9.6 (br s, 1H) ppm; MS (ES⁺) 497.4

Compound IA-168: 3-[5-(aminomethyl)-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.16-1.19 (m, 6H), 1.23 (s, 3H), 3.46 (t, 1H), 4.06 (s, 2H), 7.96 (d, 2H), 8.31 (d, 2H) and 9.02 (s, 1H) ppm; MS (ES⁺) 375.17

Compound IA-173: 3-[5-[5-(aminomethyl)-2-thienyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 3.46-3.51 (m, 1H), 4.41 (s, 2H), 7.45 (d, 1H), 7.96 (d, 1H), 7.98 (d, 2H), 8.30 (br s, 2H), 8.37 (d, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 457.3

Compound IA-185: 3-[5-[3-(azetidin-3-yl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 3.48 (m, 1H), 4.19 (m, 2H), 4.34 (m, 3H), 7.71-7.79 (m, 2H), 7.97 (m, 2H), 8.12 (m, 1H), 8.20 (m, 1H), 8.41 (m, 2H), 8.69 (br s, 1H) and 9.09 (s, 1H) ppm; MS (ES⁺) 477.29

Compound IA-201: 3-[5-(4-aminophenyl)-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.21 (d, 6H), 3.47 (m, 1H), 6.10 (s, 2H), 6.75 (d, 2H), 7.83 (d, 2H), 7.89 (br s, 2H), 7.97 (d, 2H), 8.39 (d, 2H) and 9.02 (s, 1H) ppm; MS (ES⁺) 437.22

Compound IA-214: 3-[5-(2-aminoethyl)-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.19 (d, 6H), 3.05 (m, 4H), 3.33 (d, 1H), 3.46 (s, 1H), 7.96 (d, 2H), 8.31 (d, 2H) and 9.02 (s, 1H) ppm; MS (ES⁺) 389.24

Compound IA-228: 3-[5-[4-[(1S)-1-aminoethyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 1.30 (d, 3H), 3.48 (m, 1H), 4.11 (q, 1H), 7.67 (d, 2H), 7.96 (v br s, 2H), 7.98 (d, 2H), 8.10 (d, 2H), 8.40 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 465.42

Compound IA-232: 5-(4-isopropylsulfonylphenyl)-3-[5-(1,2,3,6-tetrahydropyridin-4-yl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.19 (d, 6H), 2.50 (s, 2H), 2.98 (br t, 2H), 3.46 (m, 1H), 3.55 (dr d, 2H), 7.03 (s, 1H), 7.90 (br s, 2H), 7.95 (d, 2H), 8.35 (d, 2H) and 9.04 (s, 1H) ppm; MS (ES⁺) 427.4

Compound IA-282: 3-[5-[3-(1-aminoethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (m, 6H), 1.33 (m, 3H), 3.48 (m, 1H), 4.18 (m, 1H), 7.61 (m, 1H), 7.70 (m, 1H), 7.98-8.03 (m, 4H), 8.20 (m, 1H), 8.39 (m, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 465.3

Compound IA-285: 3-[5-[4-(azetidin-3-yl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 3.48 (m, 1H), 3.65 (m, 2H), 3.87 (m, 2H), 3.99 (m, 1H), 7.65 (d, 2H), 7.91 (br s, 2H), 7.98 (d, 2H), 8.14 (d, 2H), 8.39 (d, 2H) and 9.06 (s, 1H) ppm; MS (ES⁺) 477.44

Compound IA-306: 3-[5-[2-chloro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine MS (ES⁺) 499.2

Compound IA-309: 3-[5-[3-chloro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.25 (d, 6H), 2.7 (s, 3H), 3.4-3.5 (m, 1H), 4.45 (s, 2H), 7.7 (d, 1H), 8.0 (d, 2H), 8.3 (d, 1H), 8.4 (d, 2H), 9.0 (br s, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 499.2

Compound IA-311: 3-[5-[4-(1-amino-1-methyl-ethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.19 (m, 6H), 1.43 (s, 6H), 3.51 (m, 1H), 7.83 (m, 2H), 7.97 (m, 2H), 8.09 (m, 2H), 8.39 (m, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 479.27

Example 46A: 2-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenol (Compound IA-235)

Compound IA-235 was prepared using Method IV-C, Steps 1-2, followed by Method IV-X, Steps 1-2, followed by Method IV-AS, Step 1.

Method IV-AS Step 1: 2-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenol

LiOH (292.0 μL of 1 M, 0.2920 mmol) was added to a suspension of 2-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)phenyl acetate (14 mg, 0.02920 mmol) in THF (5 mL) at ambient temperature. After 3 h, a further portion of LiOH (292.0 μL of 1 M, 0.2920 mmol) was added and the reaction continued to stir at room temperature for 1 h. 1M HCl was added dropwise until the reaction mixture was acidic and the resultant precipitate isolated by filtration. The solid residue was dissolved in a mixture of MeCN and water and lyopholised to give the product as a green solid (5.1 mg, 38% yield); 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 3.46 (m, 1H), 6.98-7.22 (m, 2H), 7.36-7.59 (m, 1H), 7.75-8.16 (m, 5H), 8.37 (d, 2H), 9.06 (s, 1H) and 10.43 (s, 1H) ppm; MS (ES⁺) 438.2

The following compounds were all prepared using a method similar to the one described for Compound IA-235 above.

Compound IA-193: 4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenol 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 3.47 (m, 1H), 7.03 (dd, 2H), 7.89 (br s, 2H), 7.97 (dd, 2H), 8.02 (dd, 2H), 8.39 (dd, 2H), 9.04 (s, 1H) and 10.44 (s, 1H) ppm; MS (ES⁺) 438.2

Example 47A: 5-(4-isopropylsulfonylphenyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (Compound IA-159)

Compound IA-159 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AT, Step 1.

Method IV-AT Step 1: 5-(4-isopropylsulfonylphenyl)-3-[5-[4-(methylaminomethyl) phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine

MeNH₂ in ethanol (184.9 g, 243.6 mL of 33% w/w, 1.965 mol) was added in one portion to a stirred solution of 3-[5-[4-(bromomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine (10.11 g, 19.65 mmol) in CH₂Cl₂ (1.01 L) and methanol (1.01 L) and the resulting mixture stirred overnight at room temperature. Nitrogen was bubbled through reaction for 2 h and then the reaction mixture was concentrated in vacuo. The crude material was stirred in K₂CO₃ (393.0 mL of 0.25 M, 98.25 mmol) for 2 h and then isolated by filtration and washed with water. Triturated with warm acetonitrile to leave the product as a yellow solid (7.19 g, 75% yield); 1H NMR (400 MHz, DMSO) δ 1.19-1.21 (d, 6H), 2.30 (m, 3H), 3.35-3.49 (m, 1H), 3.77 (m, 2H), 7.61-7.63 (d, 2H), 7.97-7.99 (d, 2H), 8.11-8.13 (d, 2H), 8.39-8.41 (d, 2H) and 9.06 (s, 1H) ppm; MS (ES⁺) 465.4

The following compounds were all prepared using a method similar to the one described for Compound IA-159 above.

Compound IA-119: 5-(4-isopropylsulfonylphenyl)-3-[5-[4-[(2-methoxyethylamino) methyl]phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 2.67 (t, 2H), 3.25 (s, 3H), 3.43 (t, 2H), 3.48 (m, 1H), 3.84 (s, 2H), 7.62 (d, 2H), 7.97 (d, 2H), 7.98 (v br s, 2H), 8.12 (d, 2H), 8.40 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 509.37

Compound IA-122: 3-[5-[4-(ethylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.17-1.22 (m, 9H), 2.89 (q, 2H), 3.48 (m, 1H), 4.15 (s, 2H), 7.77 (d, 2H), 7.98 (d, 2H), 7.99 (br s, 2H), 8.21 (d, 2H), 8.41 (d, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 479.41

Compound IA-139: 2-[[4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methylamino]-2-(hydroxymethyl)propane-1,3-diol 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 3.44 (s, 6H), 3.45 (m, 1H), 3.90 (s, 2H), 4.37 (br s, 3H), 7.66 (d, 2H), 7.95 (br s, 2H), 7.98 (d, 2H), 8.11 (d, 2H), 8.40 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 555.32

Compound IA-146: 5-(4-isopropylsulfonylphenyl)-3-[5-[3-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.19 (d, 6H), 2.33 (s, 3H), 3.48 (m, 1H), 3.83 (s, 2H), 7.61-7.67 (m, 2H), 7.97 (m, 3H), 8.05 (m, 1H), 8.15 (m, 1H), 8.39 (m, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 465.29

Compound IA-158: 3-[5-[4-[(cyclopropylamino)methyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 0.28 (m, 2H), 0.36 (m, 2H), 1.20 (d, 6H), 2.07 (m, 1H), 3.48 (m, 1H), 3.85 (s, 2H), 7.61 (d, 2H), 7.96 (br s, 2H), 7.98 (d, 2H), 8.11 (d, 2H), 8.40 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 491.42

Compound IA-178: 2-(4-(5-(3-amino-6-(4-(isopropyl sulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)benzylamino)ethanol 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 2.61 (t, 2H), 3.42-3.51 (m, 3H), 3.86 (s, 2H), 4.54 (br s, 1H), 7.63 (d, 2H), 7.80 (br s, 2H), 7.98 (d, 2H), 8.12 (d, 2H), 8.39 (d, 2H) and 9.06 (s, 1H) ppm; MS (ES⁺) 495.31

Compound IA-225: N-[[4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl]-N′,N′-dimethyl-ethane-1,2-diamine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 3.07 (s, 3H), 3.29-3.49 (m, 5H), 4.74 (s, 2H), 7.91 (d, 2H), 7.97 (d, 2H), 7.98 (v br s, 2H), 8.27 (d, 2H), 8.40 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 522.23

Compound IA-238: [4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methanol 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 3.48 (m, 1H), 6.64 (d, 2H), 5.46 (t, 1H), 7.61 (d, 2H), 7.98 (d, 2H), 7.99 (br s, 2H), 8.15 (d, 2H), 8.40 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 452.26

Compound IA-243: 3-[5-[4-(dimethylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (m, 6H), 2.21 (s, 6H), 3.47 (m, 1H), 3.54 (s, 2H), 7.59 (d, 2H), 7.90 (br s, 2H), 7.97 (d, 2H), 8.13 (d, 2H), 8.39 (d, 2H) and 9.06 (s, 1H) ppm; MS (ES⁺) 479.37

Compound IA-333: (R)-2-(4-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)-3-fluorobenzylamino)propan-1-ol 1H NMR (400 MHz, DMSO) δ 1.06 (3H, d), 1.20 (d, 6H), 2.44 (m, 1H), 3.35 (obscured, 2H), 3.48 (m, 1H), 3.85 (m, 2H), 4.53 (m, 1H), 7.47 (d, 1H), 7.52 (d, 1H), 7.97 (br s, 2H), 7.98 (d, 2H), 8.12 (t, 1H), 8.37 (d, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 527.2

Compound IA-334: (S)-1-(4-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)-3-fluorobenzylamino)propan-2-ol 1H NMR (400 MHz, DMSO) δ 1.06 (d, 3H), 1.20 (d, 6H), 3.45 (m, 1H), 3.71 (m, 1H), 4.53 (d, 1H), 7.46 (d, 1H), 7.52 (d, 1H), 7.97 (br s, 2H), 7.98 (d, 2H), 8.12 (t, 1H), 8.37 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 527.2

Compound IA-335: (S)-2-(4-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)-3-fluorobenzylamino)propan-1-ol 1H NMR (400 MHz, DMSO) δ 0.97 (d, 3H), 1.20 (d, 6H), 2.62 (m, 1H), 3.30 (m, 2H), 3.48 (m, 1H), 3.88 (m, 2H), 4.58 (m, 1H), 7.47 (d, 1H), 7.53 (d, 1H), 7.97 (br s, 2H), 7.98 (d, 2H), 8.12 (t, 1H), 8.37 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 527.2

Compound IA-336: 3-[5-[3-fluoro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (m, 6H), 2.68 (m, 3H), 3.48 (m, 1H), 4.34 (m, 2H), 7.86 (t, 1H), 7.99 (m, 2H), 8.09 (m, 1H), 8.14 (dd, 1H), 8.42 (m, 2H), 8.96 (br s, 2H) and 9.11 (s, 1H) ppm; MS (ES⁺) 483.1

Compound IA-340: 3-[5-[2-fluoro-4-[(2-fluoroethylamino)methyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 2.81 (m, 2H), 3.48 (m, 1H), 3.88 (s, 2H), 4.51 (m, 2H), 7.47 (d, 1H), 7.52 (d, 1H), 7.97 (br s, 2H), 7.98 (d, 2H), 8.12 (t, 1H), 8.37 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 515.2

Compound IA-341: (R)-1-(4-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)-3-fluorobenzylamino)propan-2-ol 1H NMR (400 MHz, DMSO) δ 1.06 (dd, 3H), 1.20 (dd, 6H), 3.45 (m, 1H), 3.71 (m, 1H), 4.53 (m, 1H), 7.46 (d, 1H), 7.52 (d, 1H), 7.97 (br s, 2H), 7.98 (d, 2H), 8.12 (t, 1H), 8.37 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 527.2

Compound IA-345: 3-[5-[2-fluoro-4-[(tetrahydrofuran-3-ylamino)methyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 1.70-1.74 (m, 1H), 1.90-1.98 (m, 1H), 3.25-3.32 (m, 1H), 3.41-3.50 (m, 2H), 3.60-3.85 (m, 5H), 7.47 (d, 1H), 7.53 (d, 1H), 7.97 (br s, 2H), 7.98 (d, 2H), 8.12 (t, 1H), 8.37 (d, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 539.3

Compound IA-346: 3-[5-[4-[(2-fluoroethylamino)methyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 2.82 (m, 2H), 3.48 (m, 1H), 3.87 (s, 2H), 4.50 (m, 2H), 7.64 (d, 2H), 7.97 (br s, 2H), 7.98 (d, 2H), 8.13 (d, 2H), 8.40 (d, 2H) and 9.06 (s, 1H) ppm; MS (ES⁺) 497.2

Compound IA-348: 1-(4-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)-3-fluorobenzylamino)-2-methylpropan-2-ol 1H NMR (400 MHz, DMSO) δ 1.13 (s, 6H), 1.20 (d, 6H), 2.39 (s, 2H), 3.48 (m, 1H), 3.88 (s, 2H), 4.27 (s, 1H), 7.45 (d, 1H), 7.51 (d, 1H), 7.97 (br s, 2H), 7.98 (d, 2H), 8.12 (t, 1H), 8.37 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 541.2

Compound IA-319: 3-[5-[2-fluoro-4-[(oxetan-3-ylamino)methyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 4.48 (m, 1H), 3.77 (s, 2H), 3.80 (m, 1H), 4.34 (t, 2H), 4.59 (t, 2H), 7.45 (d, 1H), 7.51 (d, 1H), 7.97 (br s, 2H), 7.98 (d, 2H), 8.12 (t, 1H), 8.37 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES+) 525.2

Example 48A: 4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]benzamidine (Compound IA-70)

Compound IA-70 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AU, Step 1

Method IV-AU Step 1: 4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]benzamidine

4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]benzonitrile (58 mg, 0.1299 mmol) was suspended in a mixture of CH₂Cl₂ (3 mL)/ethanol (4 mL, 68.51 mmol), sonicated then stirred at 0° C. during the addition of HCl gas until saturated. The resulting suspension was stirred at room temperature for 4 h, then warmed to 40° C. and stirred overnight. The mixture was concentrated to dryness under reduced pressure then suspended in absolute ethanol (60 ml), cooled in ice bath and ammonia gas bubbled through for 5 min. The reaction vessel was sealed and then stirred at room temperature for 3 h, then heated at 50° C. overnight. The reaction mixture was concentrated in vacuo and purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lyopholised to give the product as a pale yellow powder (16.7 mg, 32% yield); 1H NMR (400 MHz, DMSO) δ 1.21 (d, 6H), 3.48 (m, 1H), 6.80 (br s, 2H), 7.98 (d, 2H), 8.05 (d, 2H), 8.21 (d, 2H), 8.41 (d, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 464.24

The following compounds were all prepared using a method similar to the one described for Compound IA-70 above.

Compound IA-208: 4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-N-methyl-benzamidine 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 2.88 (s, 3H), 3.48 (m, 1H), 6.83 (br s, 1H), 7.98 (br s, 2H), 7.99 (d, 2H), 8.03 (d, 2H) 8.19 (d, 2H), 8.41 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 478.24

Example 49A: 4-[5-[3-amino-6-[4-(2-dimethylaminoethylsulfonyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenol (Compound IA-191)

Compound IA-191 was prepared using Method IV-AJ, Steps 1-2, followed by Method IV-AV, Step 1.

Method IV-AV Step 1: 4-[5-[3-amino-6-[4-(2-dimethylaminoethylsulfonyl)phenyl]pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenol

2-(4-bromophenyl)sulfonyl-N,N-dimethyl-ethanamine (181.8 mg, 0.6221 mmol) was dissolved in dioxane (2 mL) and bis(pinacolato)diboron (237.0 mg, 0.9332 mmol) and potassium acetate (183.1 mg, 1.866 mmol) were added. The reaction mixture was degassed and filled with nitrogen (5×) then Pd(dppf)Cl₂.CH₂Cl₂ (50.80 mg, 0.06221 mmol) was added and the reaction heated to 90° C. for 2 hours. The reaction mixture was cooled to ambient temperature and diluted with DMF (2 mL). [4-[5-(3-amino-6-bromo-pyrazin-2-yl)-1,3,4-oxadiazol-2-yl]phenyl] acetate (234 mg, 0.6221 mmol), Na₂CO₃ (933.0 μL of 2 M aqueous solution, 1.866 mmol) and Pd(PPh₃)₂Cl₂ (43.67 mg, 0.06221 mmol) were added and the reaction heated at 150° C. under microwave conditions for 30 minutes. The reaction mixture was partitioned between EtOAc (5 mL) and water (5 mL) and any precipitate removed by filtration. The layers were separated and the aqueous layer extracted with EtOAc (3×5 mL) and the combined organic extracts dried over MgSO₄, filtered and concentrated in vacuo. The residue was triturated form EtOAc/MeOH to give the title compound as a brown solid (44.3 mg, 15%); 1H NMR (400 MHz, DMSO) δ 2.07 (s, 6H), 2.56 (t, 2H), 3.52 (t, 2H), 7.03 (d, 2H), 7.87 (br s, 2H), 8.02 (dd, 4H), 8.38 (d, 2H), 9.05 (s, 1H) and 10.44 (s, 1H) ppm; MS (ES⁺) 467.2

Example 50A: 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-amine (Compound IA-270)

Compound IA-270 was prepared using Method IV-B, Steps 1-2, followed by Method IV-AW, Steps 1-2.

Method IV-AW Step 1: 2-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazine-2-carbonyl)hydrazinecarbothioamide

TBTU (749.4 mg, 2.334 mmol) and Et₃N (157.5 mg, 216.9 μL, 1.556 mmol) were added to a suspension of 3-amino-6-(4-isopropylsulfonylphenyl)pyrazine-2-carboxylic acid (500 mg, 1.556 mmol) and aminothiourea (141.8 mg, 1.556 mmol) in DMF (10 mL). The reaction was allowed to stir at ambient temperature for 1 h. The reaction mixture was added to rapidly stirring water and the resultant precipitate isolated by filtration to give the product as a khaki solid (587 mg, 96%) 1H NMR (400 MHz, DMSO) δ 1.18 (d, 6H), 3.40-3.56 (m, 1H), 7.64 (s, 2H), 7.79 (s, 2H), 7.88 (d, 2H), 8.56 (d, 1H), 9.03 (s, 1H), 9.41 (s, 1H) and 10.75 (s, 1H) ppm; MS (ES⁺) 395.2

Step 2: 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-amine

EDC (109.3 mg, 0.5704 mmol) was added to a stirred suspension of [[3-amino-6-(4-isopropylsulfonylphenyl)pyrazine-2-carbonyl]amino]thiourea (150 mg, 0.3803 mmol) in DCE (3.000 mL) and the reaction mixture heated at reflux for 22 h. The solvent was removed in vacuo and the residue partitioned between EtOAc and water. The aqueous layer was extracted with EtOAc (3×10 mL) and the combined organic extracts dried MgSO₄, filtered and concentrated in vacuo to give the sub-title compound as a yellow solid (118 mg, 86%) 1H NMR (400 MHz, DMSO) δ 1.19 (d, 6H), 3.45 (dt, 1H), 7.65-7.80 (m, 4H), 7.95 (d, 2H), 8.26 (d, 2H) and 8.89 (s, 1H) ppm; MS (ES⁺) 361.0

Example 51: 3-[5-[5-(ethylaminomethyl)-2-thienyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine (Compound IA-83)

Compound IA-83 was prepared using Method IV-C, Steps 1-2, followed by Method IV-X, Steps 1-2, followed by Method IV-AX, Steps 1-3.

Method IV-AX Step 1: di-tert-butyl N-[5-(4-isopropylsulfonylphenyl)-3-[5-(5-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]iminodicarbonate

5-(4-isopropylsulfonylphenyl)-3-[5-(5-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (600 mg, 1.359 mmol) was added to MeCN (50 mL) followed by the addition of BOC₂O (889.8 mg, 936.6 μL, 4.077 mmol) and DMAP (8.301 mg, 0.06795 mmol). The resulting mixture was stirred overnight at room temperature. The reaction mixture was concentrated in vacuo to leave a solid which was purified by column chromatography on silica gel eluting with 50% EtOAc/petroleum ether (544.6 mg, 74%) 1H NMR (400 MHz, CDCl₃) δ 1.29 (d, 6H), 1.36 (s, 9H), 2.54 (s, 3H, 3.20 (m, 1H), 6.83 (m, 1H), 7.71 (m, 1H), 8.03 (m, 2H), 8.31 (m, 2H) and 9.06 (s, 1H) ppm

Step 2: di-tert-butyl 3-(5-(5-(bromomethyl)thiophen-2-yl)-1,3,4-oxadiazol-2-yl)-5-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yliminodicarbonate

To a solution of di-tert-butyl N-[5-(4-isopropylsulfonylphenyl)-3-[5-(5-methyl-2-thienyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]iminodicarbonate (700 mg, 1.292 mmol) in ethyl acetate (50 mL) was added NBS (299.0 mg, 1.680 mmol) and AIBN (42.43 mg, 0.2584 mmol). The resulting mixture was heated to reflux for 2 h. The reaction mixture was cooled to room temperature and filtered, washed with water and the organic layer was dried over MgSO₄ and concentrated in vacuo to a yellow solid which was used in the next stage without further purification.

Step 3: 3-[5-[5-(ethylaminomethyl)-2-thienyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine

To a solution of di-tert-butyl 3-(5-(5-(bromomethyl)thiophen-2-yl)-1,3,4-oxadiazol-2-yl)-5-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yliminodicarbonate (90 mg, 0.1450 mmol) in ethanol (2 mL) at room temperature was added ethylamine (7.250 mL of 2 M in ethanol, 14.50 mmol). The resulting mixture was stirred at room temperature 1 h. The mixture was concentrated in vacuo to leave a solid. The solid was redissolved in CH₂Cl₂ and concentrated to a solid to remove any remaining methanol. The solid was dissolved in CH₂Cl₂ (3 mL) and TFA (165.3 mg, 111.7 μL, 1.450 mmol) was added. The mixture was stirred at room temperature for 2 h and then concentrated in vacuo and the residue purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10% -95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lyopholised to give the product as a pale yellow powder (63 mg, 73.5%); 1H NMR (400 MHz, DMSO) δ 1.20-1.25 (m, 9H), 3.0-3.1 (m, 2H), 3.42-3.46 (m, 1H), 4.5 (s, 2H), 7.5 (d, 1H), 7.95 (d, 1H), 8.01 (d, 1H), 8.38 (d, 1H), 9.0 (br s, 2H) and 9.18 (s, 1H) ppm; MS (ES⁺) 485.4

The following compounds were all prepared using a method similar to the one described for Compound IA-83 above.

Compound IA-140: 5-(4-isopropylsulfonylphenyl)-3-[5-[5-(methylaminomethyl)-2-thienyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.22 (d, 6H), 2.65 (s, 3H), 3.42-3.46 (m, 1H), 4.5 (s, 2H), 7.5 (d, 1H), 8.0 (d, 1H), 8.05 (d, 1H), 8.4 (d, 1H), 9.05 (br s, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 471.3

Compound IA-226: 5-(4-isopropylsulfonylphenyl)-3-[5-[4-(methylaminomethyl)-2-thienyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400 MHz, MeOD) δ 1.4 (d, 6H), 2.8 (s, 3H), 4.4 (s, 2H), 3.3-3.4 (m, 1H), 8.0-8.1 (m, 3H), 8.12 (s, 1H), 8.35 (d, 2H) and 9.0 (s, 1H) ppm; MS (ES⁺) 471.3

Compound IA-236: 3-[5-[5-[(2,2-difluoroethylamino)methyl]-2-thienyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.25 (d, 6H), 3.4-3.6 (m, 3H), 4.55 (s, 2H), 6.2-6.5 (m, 1H), 7.5 (d, 1H), 7.8-8.1 (m, 4H), 8.45 (d, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 521.3

Compound IA-248: 3-[5-[5-[(isopropylamino)methyl]-2-thienyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.25 (m, 6H), 1.35 (d, 6H), 3.4-3.6 (m, 2H), 4.6 (s, 2H), 7.5 (d, 1H), 7.95-8.1 (m, 4H), 8.45 (d, 2H), 8.9-9.0 (br s, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 499.4

Example 52A: N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]acetamide (Compound IA-177)

Compound IA-177 was prepared using Method IV-C, Steps 1-2, followed by Method IV-AY, Steps 1-2.

Method IV-AY Step 1: N-(2-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazine-2-carbonyl) hydrazinecarbonothioyl)ethanamide

A mixture of 3-amino-6-(4-isopropylsulfonylphenyl)pyrazine-2-carbohydrazide (100 mg, 0.2982 mmol), acetyl isothiocyanate (30.16 mg, 26.20 μL, 0.2982 mmol) and dry DCE (2.000 mL) were stirred at ambient temperature for 2 h and then concentrated in vacuo. Used directly in the next step without further purification; MS (ES⁺) 437.20

Step 2: N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]acetamide

N-(2-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazine-2-carbonyl)hydrazinecarbonothioyl) acetamide (47 mg, 0.1077 mmol) was dissolved in DMF (2 mL) and EDC (30.98 mg, 0.1616 mmol) was added. The reaction was allowed to stir at ambient temperature for 45 minutes then warmed to 100° C. for 1 hour. The reaction mixture was cooled to ambient temperature then added slowly to stirred water. The resultant precipitate was isolated by filtration to give the sub-title product as a yellow solid (31 mg, 68%); 1H NMR (400 MHz, DMSO) δ 1.18 (d, 6H), 2.20 (s, 3H), 3.41-3.49 (m, 1H), 7.81 (br s, 2H), 8.14 (d, 2H), 8.27 (d, 2H), 8.99 (s, 1H) and 11.98 (s, 1H) ppm; MS (ES⁺) 403.2

Example 53A: 2-amino-N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]acetamide (Compound IA-82)

Compound IA-82 was prepared using Method IV-C, Steps 1-2, followed by Method IV-AY, Steps 1-2, followed by Method IV-AZ, Step 1.

Method IV-AZ Step 1: 2-amino-N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]acetamide

Hydrazine hydrate (8.065 mg, 7.838 μL, 0.1611 mmol) was added to a stirred suspension of N-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)-2-(1,3-dioxoisoindolin-2-yl)acetamide (147 mg, 0.1611 mmol) in MeOH (5 mL)/CH₂Cl₂ (5 mL) and the reaction mixture was allowed to stir at ambient temperature for 2 hours. A further portion of hydrazine hydrate (16.13 mg, 15.68 μL, 0.3222 mmol) was added and the reaction stirred for a further 16 hours. The solvent was removed in vacuo and residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were collected and freeze-dried to give the title compound as a yellow solid (10 mg, 11%); 1H NMR (400.0 MHz, DMSO) δ 1.18 (d, 6H), 3.50-3.53 (m, 1H), 4.11 (s, 1.4H), 4.33 (s, 0.6H), 7.81 (s, 2H), 7.91 (d, 2H), 8.53 (d, 2H), 9.07 (s, 1H), 10.99 (s, 0.7H) and 11.16 (s, 0.3H) ppm; MS (ES⁺) 418.2

The following compounds were all prepared using a method similar to the one described for Compound IA-82 above.

Compound IA-219: 2-amino-N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-2-methyl-propanamide 1H NMR (400.0 MHz, DMSO) δ 1.18 (d, 6H), 1.21 (s, 6H), 3.43-3.53 (m, 1H), 7.80 (br s, 2H), 7.88 (d, 2H), 8.08 (s, 1H), 8.54 (d, 2H), 9.01 (s, 1H), 10.49 (br s, 1H) and 10.62 (s, 1H) ppm; MS (ES⁺) 446.2

Compound IA-272: 2-amino-N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]propanamide 1H NMR (400.0 MHz, DMSO) δ 1.19 (d, 6H), 1.30 (d, 1.8H), 1.39 (d, 1.2H), 3.46-3.53 (m, 1H), 4.34 (br s, 0.6H), 4.54 (br s, 0.4H), 7.82 (br s, 2H), 7.91 (d, 2H), 8.50-8.55 (m, 2H), 9.09 (s, 1H), 11.06 (br s, 0.6H) and 11.17 (br s, 0.4H) ppm; MS (ES⁺) 432.2

Example 54A: 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-N-(3-piperidyl)-1,3,4-oxadiazol-2-amine (Compound IA-199)

Compound IA-199 was prepared using Method IV-C, Steps 1-2, followed by Method IV-K, Step 1, followed by Method IV-AAA, Step 1.

Method IV-AAA Step 1: 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-N-(3-piperidyl)-1,3,4-oxadiazol-2-amine

DIPEA (173.6 μL, 1.0 mmol), tert-butyl 3-aminopiperidine-1-carboxylate (99.7 mg, 0.50 mmol) and bromo(tripyrrolidin-1-yl)phosphonium hexafluorophosphate (340.6 mg, 0.73 mmol) were added to a mixture of 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-3H-1,3,4-oxadiazol-2-one (120 mg, 0.33 mmol) in DMF (600 μL) and DMSO (600 μL). The resulting mixture was stirred at room temperature for 4.5 h. The reaction mixture was diluted with EtOAc (5 mL) and saturated aqueous sodium hydrogen carbonate solution (5 mL). The aqueous layer was washed with EtOAc (3×5 mL) and the combined organic extracts dried over MgSO₄, filtered and concentrated in vacuo. The residue was taken up in methanol (1.2 mL) and HCl (332 μL, 1.0 mmol, 3M solution in methanol) and the resulting solution stirred at room temperature overnight. The reaction mixture was evaporated to dryness and the solid triturated with acetonitrile and then purified further by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were passed through a bicarbonate cartridge and lyopholised to give the title compound as a yellow solid (29.6 mg, 20%); H NMR (400.0 MHz, DMSO) δ 1.19 (d, 6H), 1.43-1.48 (m, 2H), 1.64-1.67 (m, 1H), 1.99-2.01 (m, 1H), 2.40-2.46 (m, 2H), 2.77-2.80 (m, 1H), 3.10-3.14 (m, 1H), 3.46-3.55 (m, 2H), 7.80 (br s, 1H), 7.95 (d, 2H), 8.23 (t, 2H), 8.27 (s, 1H) and 8.89 (s, 1H) ppm; MS (ES⁺) 444.25

The following compounds were all prepared using a method similar to the one described for Compound IA-199 above.

Compound IA-97: N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]propane-1,3-diamine 1H NMR (400.0 MHz, DMSO) δ 1.18 (d, 7H), 1.67 (t, 2H), 2.64 (t, 2H), 3.00-3.01 (m, 2H), 3.46-3.50 (m, 1H), 6.75 (br s, 1H), 7.80 (br s, 1H), 7.95 (d, 2H), 8.26 (d, 2H) and 8.89 (s, 1H) ppm; MS (ES⁺) 418.21

Compound IA-109: 3-[5-(4-amino-1-piperidyl)-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.19 (d, 6H), 1.45-1.60 (m, 2H), 1.94 (s, 2H), 2.08 (s, 1H), 3.17-3.25 (m, 4H), 3.45 (t, 2H), 4.00 (s, 2H), 7.75 (br s, 1H), 7.93 (d, 2H), 8.32 (d, 2H) and 8.93 (s, 1H) ppm; MS (ES⁺) 444.21

Compound IA-111: 3-[5-(3-aminoazetidin-1-yl)-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.18 (dd, 6H), 2.35 (br s, 2H), 2.95 (br s, 2H), 3.40-3.55 (m, 1H), 3.85-4.01 (m, 2H), 4.00-4.30 (m, 2H), 7.75 (br s, 1H), 7.94 (d, 2H), 8.27 (d, 2H) and 8.91 (s, 1H) ppm; MS (ES⁺) 416.2

Compound IA-138: 3-[5-[4-(aminomethyl)-1-piperidyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.16-1.19 (m, 6H), 1.20-1.40 (m, 3H), 1.50-1.95 (m, 3H), 2.08 (s, 1H), 2.54 (s, 1H), 2.85-3.35 (m, 3H), 3.40-3.50 (m, 1H), 3.95-4.10 (m, 2H), 7.75 (br s, 1H), 7.94 (d, 2H), 8.31 (d, 2H) and 8.92 (s, 1H) ppm; MS (ES⁺) 458.21

Compound IA-188: 3-[5-(3-aminopyrrolidin-1-yl)-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.05 (d, 6H), 1.95-2.05 (m, 1H), 2.20-2.30 (m, 1H), 2.95 (t, 3H), 3.40-3.55 (m, 2H), 3.60-3.70 (m, 1H), 3.70-3.80 (m, 2H), 3.80-3.90 (m, 1H), 5.15 (s, 1H), 7.80 (d, 2H), 8.16 (d, 2H) and 8.78 (s, 1H) ppm; MS (ES⁺) 430.27

Compound IA-227: 3-[5-[3-(aminomethyl)-1-piperidyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine MS (ES⁺) 458.23

Compound IA-206: 3-[5-(3-amino-1-piperidyl)-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.19 (d, 6H), 1.45-1.65 (m, 1H), 1.75-1.90 (m, 2H), 2.08 (s, 1H), 2.75-3.20 (m, 5H), 3.40-3.50 (m, 1H), 3.75-3.95 (m, 2H), 7.75 (s, 2H), 7.94 (d, 2H), 8.32 (d, 2H) and 8.91 (s, 1H) ppm; MS (ES⁺) 444.21

Compound IA-239: 5-(4-isopropylsulfonylphenyl)-3-(5-piperazin-1-yl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.18 (d, 6H), 2.67 (s, 1H), 2.98 (s, 3H), 3.10 (d, 2H), 3.40-3.50 (m, 1H), 3.57-3.60 (m, 4H), 7.75 (br s, 1H), 7.93 (d, 2H), 8.32 (d, 2H) and 8.93 (s, 1H) ppm; MS (ES⁺) 430.23

Compound IA-318: 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-N-(4-piperidyl)-1,3,4-oxadiazol-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.18 (d, 6H), 1.35-1.45 (m, 2H), 1.95-2.00 (m, 2H), 2.95-3.00 (m, 2H), 3.40-3.55 (m, 2H), 7.95 (d, 2H), 8.25-8.35 (m, 3H) and 8.90 (s, 1H) ppm; MS (ES⁺) 444.2

Example 55: 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-N-pyrrolidin-3-yl-1,3,4-oxadiazole-2-carboxamide (Compound IA-114)

Compound IA-114 was prepared using Method IV-C, Steps 1-2, followed by Method IV-AAB, Steps 1-3.

Method IV-AAB Step 1: ethyl 2-(2-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazine-2-carbonyl)hydrazinyl)-2-oxoethanoate

3-amino-6-(4-isopropylsulfonylphenyl)pyrazine-2-carbohydrazide (2 g, 5.963 mmol) and Et3N (1.810 g, 2.493 mL, 17.89 mmol) were dissolved in THF (128.0 mL) and treated dropwise with ethyl 2-chloro-2-oxo-acetate (814.2 mg, 666.3 μL, 5.963 mmol) at 0° C. The reaction mixture was warmed slowly to room temperature and stirred for 1.5 h. The reaction mixture was filtered and grey solid washed with THF. The filtrate was evaporated to dryness azeotroping with acetonitrile. Then residue was then triturated with acetonitrile to give the product as a yellow solid (1.52 g, 58%); 1H NMR (400 MHZ, DMSO) d 1.19 (m, 6H), 1.32 (m, 3H), 3.34 (m, 1H), 4.32 (m, 2H), 7.88 (m, 2H), 8.56 (m, 2H), 9.07 (s, 1H), 10.95 (s, 1H) and 11.05 (s, 1H) ppm; MS (ES⁺) 436.32

Step 2: ethyl 5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazole-2-carboxylate

To a stirred solution of ethyl 2-(2-(3-amino-6-(4-(isopropylsulfonyl)phenyl) pyrazine-2-carbonyl)hydrazinyl)-2-oxoacetate (1.1894 g, 2.731 mmol) was in CH₂Cl₂ (23.78 mL) was added triethylamine (552.7 mg, 761.3 μL, 5.462 mmol), followed by 4-methylbenzenesulfonyl chloride (520.7 mg, 2.731 mmol) and the resulting solution stirred at room temperature for 3 h. The reaction mixture is diluted with CH₂Cl₂ and washed with water (1×20 mL), saturated aqueous sodium hydrogen carbonate solution (1×20 mL) and brine (1×20 mL). The organic extracts were dried over MgSO₄, filtered and concentrated in vacuo. The residue was triturated with acetonitrile to give the product as a yellow solid (1.03 g, 90%); 1H NMR (400 MHz, DMSO) δ 1.37 (m, 6H), 1.54 (m, 3H), 3.25 (m, 1H), 4.64 (m, 2H), 8.00 (m, 2H), 8.20 (m, 2H) and 8.83 (s, 1H) ppm; MS (ES+) 418.19

Step 3: 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-N-pyrrolidin-3-yl-1,3,4-oxadiazole-2-carboxamide

To a suspension of ethyl 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazole-2-carboxylate (100 mg, 0.34 mmol) in ethanol (2 mL), tert-butyl 3-aminopyrrolidine-1-carboxylate (49.1 mg, 0.26 mmol) was added and the resulting mixture heated under reflux overnight. The reaction mixture was cooled to room temperature and evaporated to dryness. The residue was taken up in CH₂Cl₂ (2.0 mL) and TFA (400 μL) was added and the reaction mixture stirred overnight at room temperature. The reaction mixture was passed through a bicarbonate cartridge and the filtrate concentrated in vacuo. The residue was passed through a TsOH cartridge eluting the product with 2M Ammonia in methanol (5 mL). The solid was triturated form acetonitrile to give the product as a yellow solid (44.94 mg, 41%); 1H NMR (400.0 MHz, DMSO) δ 1.19 (d, 6H), 1.75 (s, 1H), 2.00 (d, 1H), 2.73-2.78 (m, 2H), 2.94 (s, 1H), 2.95 (dd, 1H), 3.47 (t, 1H), 4.40 (br s, 1H), 7.85 (br s, 2H), 7.98 (d, 2H), 8.32-8.34 (m, 2H), 9.09 (s, 1H) and 9.46 (d, 1H) ppm; MS (ES+) 458.22

The following compounds were all prepared using a method similar to the one described for Compound IA-114 above.

Compound IA-79: [5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-(1,4-diazepan-1-yl)methanone; MS (ES⁺) 472.3

Compound IA-81: N-(2-aminocyclohexyl)-5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazole-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 1.19 (d, 6H), 1.21-1.30 (br s, 1H), 1.40-1.50 (m, 1H), 1.65-1.75 (m, 2H), 1.80-1.95 (m, 2H), 2.75 (br s, 2H), 3.45-3.50 (m, 3H), 3.65 (br s, 1H), 7.95 (s, 2H), 8.45 (s, 2H), 9.10 (s, 1H) and 9.30 (br s, 1H) ppm; MS (ES⁺) 486.35

Compound IA-98: [5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-(3-amino-1-piperidyl)methanone 1H NMR (400.0 MHz, DMSO) δ 1.19 (d, 6H), 1.34-1.38 (m, 1H), 1.48-1.51 (m, 1H), 1.76-1.92 (m, 3H), 2.67-2.81 (m, 2H), 3.17-3.29 (m, 2H), 3.50-3.99 (m, 1H), 4.09-4.10 (m, 0.5H), 4.12-4.23 (m, 0.5H), 4.24-4.30 (m, 1H), 7.85 (br s, 1H), 7.98 (d, 2H), 8.32 (dd, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 472.28

Compound IA-113: butyl 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazole-2-carboxylate 1H NMR (400.0 MHz, DMSO) δ 0.97 (t, 3H), 1.19 (d, 6H), 1.46 (d, 2H), 1.75-1.78 (m, 2H), 2.08 (s, 1H), 3.47-3.55 (m, 1H), 4.46 (t, 2H), 7.75 (br s, 1H), 7.99 (d, 2H), 8.31 (d, 2H) and 9.10 (s, 1H) ppm; MS (ES⁺) 446.22

Compound IA-120: (3-aminoazetidin-1-yl)-[5-[3-amino-6-(4-isopropylsulfonylphenyl) pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]methanone 1H NMR (400.0 MHz, DMSO) δ 1.18-1.20 (m, 6H), 2.50 (br s, 1H), 2.55 (s, 1H), 3.05 (br s, 2H), 3.45-3.52 (m, 1H), 3.76-3.80 (m, 1H), 3.82-3.87 (m, 1H), 4.22-4.26 (m, 1H), 4.31-4.36 (m, 1H), 4.76-4.79 (m, 1H), 7.98 (d, 2H), 8.32 (d, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 444.28

Compound IA-133: [5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-(3-aminopyrrolidin-1-yl)methanone 1H NMR (400.0 MHz, DMSO) δ 1.19 (d, 6H), 1.65-1.80 (m, 1H), 1.95-2.10 (m, 1H), 3.45-3.50 (m, 2H), 3.55-3.75 (m, 3H), 3.95-4.10 (m, 1H), 7.75 (br s, 1H), 7.98 (d, 2H), 8.32 (d, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 458.37

Compound IA-25 5: 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-N-(3-piperidylmethyl)-1,3,4-oxadiazole-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 1.05-1.10 (m, 1H), 1.19 (d, 6H), 1.25-1.35 (m, 1H), 1.55-1.59 (m, 1H), 1.73-1.75 (m, 1H), 2.19-2.22 (m, 1H), 2.33-2.40 (m, 1H), 2.80-2.82 (m, 1H), 2.91-2.94 (m, 1H), 3.18 (s, 1H), 3.18-3.21 (m, 2H), 3.47-3.50 (m, 1H), 7.85 (br s, 1H), 7.98 (d, 2H), 8.33 (d, 2H), 9.09 (s, 1H) and 9.44-9.47 (m, 1H) ppm; MS (ES⁺) 486.29

Example 56A: (2S)—N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]piperidine-2-carboxamide (Compound IA-211)

Compound IA-211 was prepared using Method IV-C, Steps 1-2, followed by Method IV-AY, Steps 1-2, followed by Method IV-AAC, Step 1.

Method IV-AAC Step 1: (2S)—N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]piperidine-2-carboxamide

Pd on C, wet, degussa (50 mg,) was added to a stirred solution of (S)-benzyl 2-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-ylcarbamoyl) piperidine-1-carboxylate (251 mg, 0.25 mmol) in MeOH (5 mL)/EtOAc (5 mL) and the reaction mixture was placed under an atmosphere of H₂. The reaction was stirred at ambient temperature for 17 hours. Once the reaction had gone to completion, the Pd was removed by filtration and the solvent was removed in vacuo. The material was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH3CN) over 16 minutes at 25 mL/min]. The fractions were collected and freeze-dried to give the product as a yellow solid (56.4 mg, 39%); 1H NMR (400.0 MHz, DMSO) δ 1.19 (d, 6H), 1.38-1.49 (m, 2H), 1.51-1.61 (m, 1H), 1.80-1.83 (m, 1H), 1.89-1.92 (m, 1H), 2.09-2.11 (m, 1H), 3.01 (br s, 2H), 3.19-3.23 (m, 1H), 3.47-3.51 (m, 1H), 4.13 (d, 1H), 4.31 (br s, 1H), 7.81 (s, 2H), 7.91 (d, 2H), 8.52 (d, 2H), 9.06 (s, 1H) and 11.04 (br s, 1H) ppm; MS (ES⁺) 472.3

The following compounds were all prepared using a method similar to the one described for Compound IA-211 above.

Compound IA-160: (1R,4S,6S)—N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-5-azabicyclo[2.2.1]heptane-6-carboxamide 1H NMR (400.0 MHz, DMSO) δ 1.18 (d, 6H), 1.34-1.45 (m, 2H), 1.55-1.76 (m, 4H), 2.68 (br d, 1H), 3.44-3.52 (m, 1H), 3.64 (s, 0.6H), 3.76 (s, 0.4H), 4.25 (s, 0.6H), 4.33 (s, 0.4H), 7.88 (d, 1.2H), 7.90 (br s, 2H), 7.92 (d, 0.8H), 8.31 (d, 0.8H), 8.53 (d, 1.2H), 9.00 (d, 1H), 10.43 (s, 0.4H) and 10.86 (s, 0.6H) ppm; MS (ES⁺) 484.3

Compound IA-217: (2S)—N-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]pyrrolidine-2-carboxamide 1H NMR (400.0 MHz, DMSO) δ 1.18 (d, 6H), 1.67-1.72 (m, 1H), 2.04-2.21 (m, 2H), 3.00 (br s, 2H), 3.35-3.41 (m, 1H), 3.45-3.59 (m, 3H), 4.28-4.34 (m, 1H), 7.82 (br s, 2H), 7.88-7.92 (m, 2H), 8.44-8.53 (m, 2H), 9.00-9.01 (2×s, 1H) and 10.87 (s, 1H) ppm; MS (ES⁺) 458.3

Example 57A: 5-(4-isopropylsulfonylphenyl)-3-[3-[4-(methylaminomethyl)phenyl]isoxazol-5-yl]pyrazin-2-amine (Compound IIA-7)

Compound IIA-7 was prepared using Method IV-F, Steps 1-2, followed by Method IV-AAD, Steps 1-4.

Method IV-AAD Step 1: tert-butyl N-(3-ethynyl-5-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)N-tert-butoxycarbonyl-carbamate

tert-butyl N-[5-bromo-3-(2-trimethylsilylethynyl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (3 g, 6.377 mmol) and (4-isopropylsulfonylphenyl)boronic acid (1.491 g, 6.536 mmol) were dissolved in MeCN (60.00 mL) then treated with water (12.00 mL) and K₃PO₄ (2.706 g, 12.75 mmol) then degassed/flushed nitrogen (×5 cycles). Treated with Pd[P(tBu)₃]₂(162.9 mg, 0.3188 mmol) and reflushed Vac/Nitrogen ×5. The resulting mixture was stirred at room temperature for 1 h. The reaction mixture was poured quickly into a mixture of ethyl acetate (500 mL), water (90 mL) and 1% aqueous sodium metabisulphite at 4° C., shaken well and the layer separated. The organic fraction was dried over MgSO₄, filtered and the filtrate was treated with 3-mercaptopropyl ethyl sulphide on silica (0.8 mmol/g)(1 g), pre-absorbed onto silica gel then purified by column chromatography on silica gel eluting with 30-40% EtOAc/petroleum ether. Product fractions were combined and concentrated in vacuo to leave the product as a yellow/brown viscous oil. Triturated with petroleum ether and some diethyl ether and a small amount of dichloromethane added. Left to stand at room temperature for 30 min and beige crystals formed, isolated by filtration to leave the product as a beige solid (1.95 g, 61%); 1H NMR (400 MHz, DMSO) δ 1.20 (m, 6H), 1.39 (s, 18H), 3.50 (m, 1H), 5.01 (s, 1H), 8.03 (m, 2H), 8.46 (m, 2H) and 9.37 (s, 1H) ppm.

Step 2: tert-butyl N-[5-(4-(isopropylsulfonyl)phenyl)-3-(3-(4-methyl)phenylisoxazol-5-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate

To a solution of tert-butyl N-tert-butoxycarbonyl-N-[3-ethynyl-5-(4-isopropylsulfonylphenyl)pyrazin-2-yl]carbamate (6.8 g, 13.56 mmol) and N-hydroxy-4-methyl-benzimidoyl chloride (2.706 g, 13.56 mmol) in THF (141.6 mL) at room temperature was added TEA (1.646 g, 2.267 mL, 16.27 mmol) dropwise over 10 min. The mixture was stirred at room temperature overnight then at 60° C. for 2 h. The reaction mixture was concentrated under reduced pressure, dissolved in CH₂Cl₂ (30 mL) and washed with brine (1×50 mL) and aqueous NaHCO₃ (1×50 mL). The organic extracts were dried over MgSO4 then decanted onto a silica gel column (300 ml). Elution with 20% EtOAc/petroleum ether to give the product (7.1 g, 82%); 1H NMR (400 Mhz, DMSO) d 1.21 (m, 6H), 1.33 (s, 18H), 3.34 (s, 3H), 3.55 (m, 1H), 7.39 (m, 2H), 7.92 (m, 2H), 8.01 (s, 1H), 8.07 (m, 2H), 8.66 (m, 2H0 and 9.51 (s, 1H) ppm

Step 3: tert-butyl N-[5-(4-(isopropylsulfonyl)phenyl)-3-(3-(4-bromomethyl)phenylisoxazol-5-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate

tert-butyl N-tert-butoxycarbonyl-N-[5-(4-isopropyl sulfonylphenyl)-3-[3-(p-tolyl)isoxazol-5-yl]pyrazin-2-yl]carbamate (1 g, 1.575 mmol) was dissolved in ethylacetate (10 mL) and NBS (364.5 mg, 2.048 mmol) and AIBN (25.86 mg, 0.1575 mmol) were added. The resulting mixture was heated to 75° C. and placed under a bright lamp for 1 h. After this time, the reaction mixture was concentrated in vacuo to an oil and this was used directly in the next stage without further purification

Step 4: 5-(4-isopropylsulfonylphenyl)-3-[3-[4-(methylaminomethyl)phenyl]isoxazol-5-yl]pyrazin-2-amine

tert-butyl N-[3-[3-[4-(bromomethyl)phenyl]isoxazol-5-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (60 mg, 0.08408 mmol) was added to a solution of methylamine in ethanol solution (791.3 mg, 8.408 mmol) in ethanol (3 mL). The reaction mixture was stirred at room temperature for 1 h and then the solvent removed in vacuo to an oil. The oil was redissolved in CH₂Cl₂ (10 ml) and concentrated to an oil to remove any excess amine. The oil was taken up in CH₂Cl₂ (5 mL) and TFA (479.4 mg, 323.9 μL, 4.204 mmol) added. The mixture was stirred at room temperature for 1 h, and the reaction mixture concentrated in vacuo. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were passed through a bicarbonate cartridge and lyopholised to give the title compound as a yellow solid (13.6 g, 28% yield); 1H NMR (400 MHz, DMSO) δ 1.22 (d, 6H), 2.6-2.65 (m, 3H), 3.5-3.6 (m, 1H), 4.2-4.25 (m, 2H), 7.2-73 (br s, 2H), 7.65 (d, 2H), 7.82 (s, 1H), 7.85 (d, 2H), 8.1 (d, 2H), 8.4 (d, 2H), 8.85 (br s, 2H) and 8.92 (s, 1H) ppm; MS (ES⁺) 464.4

The following compounds were all prepared using a method similar to the one described for Compound IIA-7 above.

Compound IIA-4: 2-(2-(4-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)isoxazol-3-yl)benzylamino)ethoxy)ethanol 1H NMR (400 MHz, DMSO) δ 1.22 (d, 6H), 3.2-3.25 (m, 2H), 3.5-3.6 (m, 2H), 3.6-3.63 (m, 2H), 3.5-3.8 (m, 2H), 4.3-4.35 (m, 2H), 4.75 (br s, 1H), 7.2-73 (br s, 2H), 7.65 (d, 2H), 7.82 (s, 1H), 7.95 (d, 2H), 8.1 (d, 2H), 8.4 (d, 2H) and 8.9-9.05 (m, 3H) ppm; MS (ES⁺) 538.4

Compound IIA-5: 3-[3-[4-(aminomethyl)phenyl]isoxazol-5-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.22 (d, 6H), 3.5-3.6 (m, 1H), 4.2-4.25 (m, 2H), 7.2-73 (br s, 2H), 7.65 (d, 2H), 7.82 (s, 1H), 7.95 (d, 2H), 8.1 (d, 2H), 8.4 (d, 2H), 8.2 (br s, 2H) and 8.97 (s, 1H) ppm; MS (ES⁺) 450.4

Compound IIA-6: 5-(4-(isopropylsulfonyl)phenyl)-3-(3-(4-((propylamino)methyl)phenyl)isoxazol-5-yl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 0.95 (t, 3H), 1.22 (d, 6H), 1.6-1.7 (m, 2H), 2.9-3.0 (m, 2H), 3.5-3.6 (m, 1H), 4.2-4.25 (m, 2H), 7.2-73 (br s, 2H), 7.65 (d, 2H), 7.82 (s, 1H), 7.95 (d, 2H), 8.1 (d, 2H), 8.4 (d, 2H), 8.8 (br s, 2H) and 8.97 (s, 1H) ppm; MS (ES⁺) 492.4

Compound IIA-8: 3-[3-[4-[(isopropylamino)methyl]phenyl]isoxazol-5-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.2 (d, 6H), 1.3 (d, 6H), 3.5-3.6 (m, 1H), 4.2-4.25 (m, 2H), 7.2-73 (br s, 2H), 7.65 (d, 2H), 7.82 (s, 1H), 7.95 (d, 2H), 8.1 (d, 2H), 8.4 (d, 2H), 8.7 (br s, 2H) and 8.95 (s, 1H) ppm; MS (ES⁺) 492.4 Compound IIA-9: 2-(4-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)isoxazol-3-yl)benzylamino)ethanol 1H NMR (400 MHz, DMSO) δ 1.22 (d, 6H), 3.0-3.1 (m, 2H), 3.5-3.6 (m, 1H), 3.65-3.7 (m, 2H), 4.2-4.25 (m, 2H), 5.3 (br s, 1H), 7.2-73 (br s, 2H), 7.65 (d, 2H), 7.82 (s, 1H), 7.95 (d, 2H), 8.1 (d, 2H), 8.4 (d, 2H), 8.8 (br s, 2H) and 8.87 (s, 1H) ppm; MS (ES⁺) 494.3

Compound IIA-10: 3-[3-[4-(ethylaminomethyl)phenyl]isoxazol-5-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400 MHz, DMSO) δ 1.22 (d, 6H), 1.25 (t, 3H), 3.0-3.1 (m, 2H), 3.5-3.6 (m, 1H), 4.2-4.25 (m, 2H), 7.2-73 (br s, 2H), 7.65 (d, 2H), 7.82 (s, 1H), 7.95 (d, 2H), 8.1 (d, 2H), 8.4 (d, 2H), 8.8 (br s, 2H) and 8.97 (s, 1H) ppm; MS (ES⁺) 478.4

Compound IIA-11: 1-(4-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)isoxazol-3-yl)benzylamino)propan-2-ol 1H NMR (400 MHz, DMSO) δ 1.05 (d, 3H), 1.22 (d, 6H), 3.0-3.1 (m, 2H), 2.65-2.7 (m, 1H), 2.8-2.85 (m, 1H), 3.5-3.6 (m, 1H), 3.8-3.85 (m, 1H), 4.2-4.25 (m, 2H), 5.3-5.33 (m, 1H), 7.2 (br s, 2H), 7.65 (d, 2H), 7.82 (s, 1H), 7.85 (d, 2H), 8.02 (d, 2H), 8.35 (d, 2H), 8.8 (br s, 2H) and 8.87 (s, 1H) ppm; MS (ES⁺) 508.4

Example 58A: 5-(4-isopropylsulfonylphenyl)-3-[5-[4-[1-(methylamino)ethyl]phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (Compound IA-212)

Compound IA-212 was prepared using Method IV-C, Steps 1-2, followed by Method IV-R, Step 1, followed by Method IV-AAE, Step 1.

Method IV-AAE Step 1: 5-(4-isopropylsulfonylphenyl)-3-[5-[4-[1-(methylamino)ethyl] phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine

A mixture of 1-[4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]ethanone (130 mg, 0.2805 mmol), methylamine hydrochloride (37.88 mg, 0.5610 mmol), Ti(OiPr)₄ (159.4 mg, 165.5 μL, 0.5610 mmol) and triethylamine (56.77 mg, 78.20 μL, 0.5610 mmol) was stirred at room temperature in ethanol (2 mL) under nitrogen overnight. The reaction mixture was treated with sodium borohydride (15.92 mg, 16.85 μL, 0.4208 mmol) and stirred at room temperature over weekend and then was quenched with aqueous ammonia (1 mL cone in 4 mL water). The mixture was extracted with dichloromethane and the organic extracts dried over MgSO₄ and concentrated in vacuo. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were passed through a bicarbonate cartridge and concentrated in vacuo. The solid was triturated with acetonitrile to give the product as a pale yellow solid (27.0 mg, 22%); 1H NMR (400 MHz, DMSO) δ 1.20 (d, 6H), 1.28 (d, 3H), 4.48 (m, 1H), 3.69 (q, 1H), 7.72 (d, 2H), 7.97 (d, 2H), 7.98 (v br s, 2H), 8.12 (d, 2H) and 9.07 (s, 1H) ppm; MS (ES⁺) 479.3

Example 59A: 5-(4-isopropylsulfonylphenyl)-3-[5-[2-methyl-4-(methylaminomethyl) phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (Compound IA-166)

Compound IA-166 was prepared using Method IV-B, Steps 1-4, followed by Method IV-AAF, Step 1.

Method IV-AAF Step 1: 5-(4-isopropylsulfonylphenyl)-3-[5-[2-methyl-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine

To a solution of tert-butyl N-[[4-[5-[3-amino-6-(4-isopropylsulfonylphenyl) pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-3-methyl-phenyl]methyl]-N-methyl-carbamate (120 mg, 0.2074 mmol) in CH₂Cl₂ (10 mL) was added TFA (709.5 mg, 479.4 μL, 6.222 mmol) and the resulting solution stirred at room temperature for 1 h. The reaction mixture was concentrated in vacuo and redissolved in CH₂Cl₂ (20 ml) and concentrated. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were combined and lyopholised to give the product as a yellow solid (48.0 mg, 39%); 1H NMR (400 MHz, DMSO) δ 1.2 (d, 6H), 2.6 (s, 3H), 2.75 (s, 3H), 3.4-3.5 (m, 1H), 4.25 (s, 2H), 7.7 (d, 1H), 7.72 (s, 1H), 8.0-8.1 (m, 3H), 8.2 (d, 1H), 8.4 (d, 2H), 8.8 (br s, 2H) and 9.2 (s, 1H) ppm; MS (ES⁺) 479.4

Example 60A: 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazole-2-carboxylic acid (Compound IA-128)

Compound IA-128 was prepared using Method IV-C, Steps 1-2, followed by Method IV-AAB, Steps 1-2, followed by Method IV-AAG, Step 1.

Method IV-AAG Step 1: 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazole-2-carboxylic acid

A solution of ethyl 5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazole-2-carboxylate (50 mg, 0.1198 mmol) in NaOH (59.90 μL of 1 M, 0.05990 mmol) was stirred at room temperature for 1 h. Water (0.5 mL) was added and the reaction mixture stirred at room temperature for 5 min and then filtered. The yellow solid obtained was dried under vacuum to give the product (30.93 mg, 62%); 1H NMR (400 MHz, DMSO) δ 1.19 (d, 6H), 3.40-3.49 (m, 1H), 7.90 (br s, 2H), 7.96 (d, 2H), 8.32 (d, 2H) and 9.00 (s, 1H) ppm; MS (ES⁺) 390.13

Example 61A: 3-(5-ethynyl-1,3,4-oxadiazol-2-yl)-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine (Compound IA-258)

Compound IA-258 was prepared using Method IV-C, Steps 1-2, followed by Method IV-AAH, Step 1.

Method IV-AAH Step 1: 3-(5-ethynyl-1,3,4-oxadiazol-2-yl)-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine

Dibromo(triphenyl)phosphorane (1.208 g, 2.862 mmol) was added to a suspension of 3-trimethylsilylprop-2-ynoic acid (84.8 mg, 0.60 mmol) and 3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazine-2-carbohydrazide (200 mg, 0.60 mmol) in acetonitrile (3.000 mL) at room temperature and the resulting solution stirred for 30 min. DIPEA (385.4 mg, 519.4 μL, 2.982 mmol) was then added and a precipitate quickly formed. The resulting mixture was stirred at room temperature for 1 h and was then filtered. The reaction mixture was concentrated in vacuo and the residue taken up in methanol (5 mL) and potassium carbonate (131.9 mg, 0.9541 mmol) added and the resulting solution stirred at room temperature overnight. The reaction mixture was diluted with ethyl acetate (5 mL) and water (5 mL) and the layers separated. The aqueous layer was extracted further with ethyl acetate (2×5 mL), dried over MgSO₄ and concentrated in vacuo. The material was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10% -95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. Product fractions were freeze dried to leave the product as a yellow solid (56.1 mg, 27% yield); 1H NMR (400 MHz, DMSO) δ 1.18 (m, 6H), 3.44 (m, 1H), 5.48 (s, 1H), 7.96 (m, 2H), 8.32 (m, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 370.14

Example 62A: 2-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]acetic acid (Compound IA-78)

Compound IA-78 was prepared using Method IV-C, Steps 1-2, followed by Method IV-X, Steps 1-2, followed by Method IV-AAI, Step 1.

Method IV-AAI Step 1: 2-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]acetic acid

TFA (500 μL, 6.490 mmol) was added to a stirred solution of tert-butyl 2-(5-(3-amino-6-(4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)acetate (45 mg, 0.083 mmol) in CH₂Cl₂ (5 mL) and the reaction stirred at ambient temperature for 18 h. The solvent was removed in vacuo and the residue azeotroped with CH₂Cl₂ (2×5 mL) and ether (2×5 mL). The material was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were collected and freeze-dried to give the title compound as a yellow solid (16.7 mg, 49%); 1H NMR (400 MHz, DMSO) δ 1.19 (d, 6H), 3.45 (m, 1H), 4.27 (s, 2H), 7.85 (br s, 2H), 7.96 (d, 2H), 8.30 (d, 2H), 9.04 (s, 1H) and 13.30 (s, 1H) ppm; MS (ES⁺) 404.2

Example 63A: 5-(4-isopropylsulfonylphenyl)-3-[5-[2-methoxy-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (Compound IA-171)

Compound IA-171 was prepared using Method IV-B, Steps 1-4, followed by Method IV-AAJ, Steps 1-3.

Method IV-AAJ Step 1: di-tert-butyl(5-(4-(isopropylsulfonyl)phenyl)-3-(5-(2-methoxy-4-methylphenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)iminodicarbonate

Di-tert-butyldicarbonate (703.2 mg, 740.2 μL, 3.222 mmol) and DMAP (7.872 mg, 0.06444 mmol) were added to a suspension of 5-(4-isopropylsulfonylphenyl)-3-[5-(2-methoxy-4-methyl-phenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (300 mg, 0.6444 mmol) in a mixture of acetonitrile (10 mL) and THF (10 mL). The reaction mixture was stirred at room temperature for 2 h and then heated at 50° C. for 2 h. The reaction mixture was cooled to room temperature and concentrated in vacuo. The residue was purified by column chromatography on silica eluting with 20% diethyl ether/petroleum ether. Product fractions were combined and concentrated in vacuo to leave the product (253 mg, 59%); MS (ES⁺) 666.31

Step 2: Di-tert-butyl(5-(4-(isopropylsulfonyl)phenyl)-3-(5-(2-methoxy-4-methylaminomethylphenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-yl)iminodicarbonate

NBS (120.3 mg, 0.6760 mmol) and AIBN (17.08 mg, 0.1040 mmol) were added to a solution of tert-butyl N-tert-butoxycarbonyl-N-[5-(4-isopropylsulfonylphenyl)-3-[5-(2-methoxy-4-methyl-phenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]carbamate (346.2 mg, 0.5200 mmol) in ethylacetate (40 mL). The resulting mixture was heated to reflux for 2 h while under a bright lamp. The reaction mixture was cooled to room temperature and added directly to methylamine in ethanol (2.447 g, 26.00 mmol) at room temperature. The reaction mixture was stirred at room temperature for 30 min and then concentrated in vacuo to leave an oil. The oil was redissolved in CH₂Cl₂ (50 ml) and concentrated in vacuo to remove any excess amine. The product was purified by column chromatography on silica eluting with 5% MeOH/CH₂Cl₂. Product fractions were combined and concentrated in vacuo to leave the product as a yellow oil. (148 mg, 41%)

Step 3: 5-(4-isopropylsulfonylphenyl)-3-[5-[2-methoxy-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine

TFA (393.7 mg, 266.0 μL, 3.453 mmol) was added to a solution of tert-butyl N-tert-butoxycarbonyl-N-[5-(4-isopropylsulfonylphenyl)-3-[5-[2-methoxy-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]carbamate (80 mg, 0.1151 mmol) CH₂Cl₂ (10 mL). The resulting mixture was stirred at room temperature for 1 h, and then concentrated in vacuo to leave an oil. The oil was re-dissolved in CH₂Cl₂ (10 ml), and evaporated to dryness. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The fractions were collected and freeze-dried to give the title compound as a yellow solid (27.1 mg, 39%); 1H NMR (400 MHz, DMSO) δ 1.3 (d, 6H), 2.65-2.7 (m, 3H), 3.4-3.5 (m, 1H), 4.0 (s, 3H), 4.25-4.3 (m, 2H), 7.25 (d, 1H), 7.5 (s, 1H), 8.0 (d, 2H), 8.1 (d, 1H), 8.38 (d, 2H), 8.92 (br s, 2H) and 9.1 (s, 1H) ppm; MS (ES⁺) 495.3

Example 64A: 5-(2-fluoro-4-isopropylsulfonyl-phenyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (Compound IA-292)

Compound IA-292 was prepared using Method IV-AAK, Steps 1-5.

Method IV-AAK Step 1: tert-butyl 4-(2-(3-amino-6-bromopyrazine-2-carbonyl)hydrazinecarbonyl) benzyl(methyl)carbamate

To a solution of tert-butyl N-[[4-(hydrazinecarbonyl)phenyl]methyl]-N-methyl-carbamate (1 g, 3.580 mmol) in DMF (7.769 mL) and 2-amino-5-bromo-pyridine-3-carboxylic acid (776.9 mg, 3.580 mmol) was added triethylamine (724.5 mg, 997.9 μL, 7.160 mmol) followed by TBTU (1.724 g, 5.370 mmol). The resulting mixture was stirred at room temperature for 48 h. The reaction mixture was diluted with ethyl acetate (20 mL) and water (20 mL) and the layers separated. The aqueous layer was extracted further with ethyl acetate (2×20 mL) and combined organic extracts washed with saturated aqueous sodium hydrogen carbonate solution (1×20 mL), brine (1×20 mL), dried over MgSO₄ and concentrated in vacuo. The residue was triturated with CH₂Cl₂ to give the product as a white solid (1.71 g, 58% yield); 1H NMR (400.0 MHz, DMSO) δ 1.39-1.45 (m, 9H), 2.80 (s, 3H), 4.45 (s, 2H), 4.45 (s, 2H), 7.28 (s, 2H), 7.35 (d, 2H), 7.90 (d, 2H), 8.20 (d, 2H), 8.24 (d, 1H), 10.50 (s, 1H) and 10.54 (s, 1H) ppm; MS (ES⁺) 480.16

Step 2: tert-butyl 4-((5-(3-amino-6-bromopyrazin-2-yl)-1,3,4-oxadiazol-2-yl)methyl) benzyl(methyl)carbamate

To a solution of tert-butyl N-[[4-[[(2-amino-5-bromo-pyridine-3-carbonyl)amino]carbamoyl]phenyl]methyl]-N-methyl-carbamate (992.3 mg, 2.074 mmol) in dry MeCN (14.88 mL) at 0° C. was added DIPEA (804.2 mg, 1.084 mL, 6.222 mmol) followed by dibromo(triphenyl)phosphorane (1.185 g, 2.696 mmol) portionwise and the resulting mixture stirred at 0° C. for 1 h and then at room temperature overnight. The reaction mixture was evaporated to dryness and then purified by column chromatography using the ISCO column companion system (40 g column, 0-20% EtOAc/petroleum ether. Product fractions were combined and concentrated in vacuo to leave the product as a white solid (681.6 mg, 63% yield); 1H NMR (400.0 MHZ, DMSO) d 1.39-1.46 (d, 9H, 4.48 (d, 2H), 7.46 (d, 2H), 8.22 (d, 2H), 8.32 (d, 1H) and 8.49 (d, 1H) ppm; MS (ES⁺) 462.12

Step 3: tert-butyl N-[[4-[5-[3-[bis(tert-butoxycarbonyl)amino]-6-bromo-pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl]-N-methyl-carbamate

Di-tert-butyl dicarbonate (1.306 g, 1.375 mL, 5.984 mmol) was added to a stirred solution of tert-butyl N-[[4-[5-(3-amino-6-bromo-pyrazin-2-yl)-1,3,4-oxadiazol-2-yl]phenyl]methyl]-N-methyl-carbamate (885 mg, 1.496 mmol) and DMAP (18.28 mg, 0.1496 mmol) in anhydrous THF (20 mL) at room temperature. The reaction was allowed to stir at room temperature for 18 h. Additional DIPEA (580.0 mg, 781.7 μL, 4.488 mmol) and di-tert-butyl dicarbonate (1.306 g, 1.375 mL, 5.984 mmol) were added and the reaction stirred at room temperature for a further 2 h. CH₂Cl₂ (10 mL) was added to aid solubility and the reaction stirred at room temperature overnight. The solvent was removed in vacuo and the residue purified by column chromatography (ISCO Companion, 40 g column, eluting with 0 to 50% EtOAc/Petroleum Ether, loaded in CH₂Cl₂) to give the product as an off-white solid (810 mg, 82% yield); 1H NMR (400.0 MHz, DMSO) δ 1.26 (s, 18H), 1.37-1.45 (m, 9H), 2.85 (br s, 3H), 4.49 (s, 2H), 7.50 (d, 2H), 8.15 (d, 2H) and 8.95 (d, 2H) ppm

Step 4: tert-butyl 4-(5-(3-bis(tert-butoxycarbonyl)amino-6-(2-fluoro-4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-1,3,4-oxadiazol-2-yl)benzyl(methyl)carbamate

tert-butyl N-[[4-[5-[3-[bis(tert-butoxycarbonyl)amino]-6-bromo-pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]methyl]-N-methyl-carbamate (100 mg, 0.1512 mmol) was dissolved in DMF (1 mL) and 2-(2-fluoro-4-isopropylsulfonyl-phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (74.44 mg, 0.2268 mmol) and Pd(PPh₃)₂Cl₂ (6.254 mg, 0.01512 mmol) were added. Na₂CO₃ (226.8 μL of 2 M, 0.4536 mmol) was added and the reaction heated at 80° C. under an atmosphere of nitrogen for 1 h in a sealed tube. The reaction mixture was partitioned between EtOAc (5 mL) and water (5 mL) and the aqueous layer extracted with EtOAc (2×5 mL). The combined organic extracts were washed with water (3×5 mL), brine (2×5 mL), dried over MgSO₄, filtered and concentrated in vacuo. The residue was purified by column chromatography (ISCO Companion, 24 g column, eluting with 0 to 50% EtOAc/Petroleum Ether, loaded in CH₂Cl₂) to give the product as an off-white solid that was used without further purification (114.4 mg, 96% yield)

Step 5: 5-(2-fluoro-4-isopropylsulfonyl-phenyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine

TFA (1 mL, 12.98 mmol) was added to a solution of tert-butyl 4-(5-(3-bis(tert-butoxycarbonyl)amino-6-(2-fluoro-4-(isopropylsulfonyl)phenyl)pyrazin-2-yl)-)-1,3,4-oxadiazol-2-yl)benzyl(methyl)carbamate (114 mg, 0.1456 mmol) in CH₂Cl₂ (5 mL). The reaction was stirred at room temperature for 2 h. The solvent was removed in vacuo and the residue azeotroped with CH₂Cl₂ (×2) and ether (×2). The material was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were collected, passed through a sodium bicarbonate cartridge and freeze-dried to give the title compound as a yellow solid (43.5 mg, 62% yield); 1H NMR (400.0 MHz, DMSO) δ 1.23 (d, 6H), 2.29 (s, 3H), 3.58 (m, 1H), 3.76 (s, 2H), 7.60 (d, 2H), 7.88 (d, 2H), 8.00 (br s, 2H), 8.10 (d, 2H), 8.32 (t, 1H) and 8.80 (s, 1H) ppm; MS (ES⁺) 483.3

The following compounds were all prepared using a method similar to the one described for Compound IA-292 above. Additionally, compounds P1 to P72, P146 and P149 can also be made using a methodology similar to the one described in Method AAK.

Compound IA-290: 5-[4-isopropylsulfonyl-3-(trifluoromethoxy)phenyl]-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.24 (d, 6H), 2.61 (s, 3H), 3.53 (sept, 1H), 4.24 (s, 2H), 7.76 (d, 2H), 8.08 (d, 1H), 8.19 (d, 2H), 8.35 (s, 1H), 8.41 (dd, 1H) and 9.17 (s, 1H) ppm; MS (ES⁺) 549.2

Compound IA-293: 5-(4-isopropylsulfonyl-2-methyl-phenyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.22 (d, 6H), 2.28 (s, 3H), 2.58 (s, 3H), 3.48 (d, 1H), 3.74 (s, 2H), 7.58 (d, 2H), 7.81-7.85 (m, 4H), 8.05 (d, J=8.2 Hz, 2H) and 8.60 (s, 1H) ppm; MS (ES⁺) 479.3

Compound IA-294: 5-(4-(cyclopentylsulfonyl)phenyl)-3-(5-(4-((methylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine Compound IA-295: 5-[5-amino-6-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-2-isopropylsulfonyl-benzonitrile 1H NMR (400.0 MHz, DMSO) δ 1.28 (d, 6H), 2.30 (s, 3H), 3.63 (m, 1H), 3.77 (s, 2H), 7.62 (d, 2H), 8.13 (d, 2H), 8.22 (d, 1H), 8.71 (dd, 1H), 8.87 (s, 1H) and 9.19 (s, 1H) ppm; MS (ES⁺) 490.3

Compound IA-298: 3-(5-(4-((methylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)-5-(4-(1-methylpyrrolidin-3-ylsulfonyl)phenyl)pyrazin-2-amine

Compound IA-300: 5-(5-isopropylsulfonyl-2-pyridyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.23 (d, 6H), 2.64 (s, 3H), 3.59 (m, 1H), 4.29 (s, 2H), 7.77 (d, 2H), 8.28 (d, 2H), 8.37-8.39 (m, 1H), 8.56 (d, 1H), 8.87 (br s, 2H), 9.05 (s, 1H) and 9.30 (s, 1H) ppm; MS (ES⁺) 466.2

Compound IA-303: 5-(6-isopropylsulfonyl-3-pyridyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.24 (d, 6H), 2.31 (s, 3H), 3.76 (m, 1H), 3.78 (s, 2H), 7.62 (d, 2H), 7.91 (br s, 2H), 8.14-8.20 (m, 3H), 8.81 (dd, 1H), 9.15 (s, 1H) and 9.54 (d, 1H) ppm; MS (ES⁺) 466.2

Compound IA-305: 5-(3-chloro-4-isopropylsulfonyl-phenyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.24 (d, 6H), 2.30 (s, 3H), 3.77 (s, 2H), 3.79 (m, 1H), 7.62 (d, 2H), 8.11-8.14 (m, 3H), 8.38 (dd, 1H), 8.44 (d, 1H) and 9.12 (s, 1H) ppm; MS (ES⁺) 499.3

Compound IA-312: 5-(4-isopropylsulfonyl-3-methyl-phenyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.20 (d, 6H), 2.33 (s, 3H), 2.74 (s, 3H), 3.50 (m, 1H), 3.82 (s, 2H), 7.64 (d, 2H), 7.96-7.98 (m, 1H), 8.14 (d, 2H), 8.20-8.23 (m, 2H) and 9.06 (s, 1H) ppm; MS (ES⁺) 479.3

Compound IA-314: 5-(3-fluoro-4-isopropylsulfonyl-phenyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.25 (d, 6H), 2.30 (s, 3H), 3.76 (s, 1H), 3.77 (s, 2H), 7.62 (d, 2H), 7.93-7.97 (m, 1H), 8.13 (d, 2H), 8.24 (s, 1H), 8.24 (dd, 1H) and 9.10 (s, 1H) ppm; MS (ES⁺) 483.2

Compound IA-316: 5-(2-chloro-4-isopropylsulfonyl-phenyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.24 (d, 6H), 2.28 (s, 3H), 3.63 (t, 1H), 3.74 (s, 2H), 7.58 (d, 2H), 7.99-8.07 (m, 5H) and 8.71 (s, 1H) ppm; MS (ES⁺) 499.2

Compound IA-322: 5-[2-(difluoromethyl)-4-isopropylsulfonyl-phenyl]-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.23 (d, 6H), 2.28 (s, 3H), 3.55-3.65 (m, 1H), 3.75 (s, 2H), 7.59-7.62 (m, 3H), 8.06 (d, 2H), 8.16 (s, 2H), 8.20 (s, 1H) and 8.80 (s, 1H) ppm; MS (ES⁺) 515.3

Compound IA-326: 5-(3-ethyl-4-isopropylsulfonyl-phenyl)-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.21 (d, 6H), 1.34 (t, 3H), 2.68 (t, 3H), 3.09 (m, 2H), 3.45 (m, 1H), 4.29 (s, 2H), 7.77 (d, 2H), 7.97 (d, 1H), 8.21-8.27 (m, 4H), 8.88 (s, 2H) and 9.11 (s, 1H) ppm; MS (ES⁺) 493.3

Compound IA-331: 2-[5-amino-6-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-5-isopropylsulfonyl-benzonitrile 1H NMR (400.0 MHz, DMSO) δ 1.23 (d, 6H), 2.29 (s, 3H), 3.66 (s, 1H), 3.75 (s, 2H), 7.60 (d, 2H), 8.13 (d, 2H), 8.24 (m, 1H), 8.38-8.42 (m, 2H) and 9.00 (s, 1H) ppm; MS (ES⁺) 490.1

Example 65A: 5-(4-isopropylsulfonylphenyl)-3-[3-[2-methyl-4-(methylaminomethyl)phenyl]isoxazol-5-yl]pyrazin-2-amine (Compound IIA-12)

Compound IIA-12 was prepared using Method IV-F, Steps 1-2, followed by Method IV-AAD, Steps 1-2, followed by Method IV-AAL, Step1.

Method IV-AAL Step 1: 5-(4-isopropylsulfonylphenyl)-3-[3-[2-methyl-4-(methylaminomethyl)phenyl]isoxazol-5-yl]pyrazin-2-amine

TFA (556.9 mg, 376.3 μL, 4.884 mmol) was added to a solution of tert-butyl N-[[4-[5-[3-[bis(tert-butoxycarbonyl)amino]-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]isoxazol-3-yl]-3-methyl-phenyl]methyl]-N-methyl-carbamate (190 mg, 0.2442 mmol) in dichloromethane (4.750 mL) and the resulting yellow solution stirred overnight at room temperature. The reaction mixture was concentrated in vacuo and the residue taken up in methanol (2 mL) and dichloromethane (1 mL) and passed through an SCX cartridge and the product eluted with 2M ammonia in methanol and concentrated in vacuo. The filtrate was purified further by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were collected and lyopholised to give the product as a yellow solid (96.4 mg, 69% yield); 1H NMR (400.0 MHz, DMSO) δ 1.18 (d, 6H), 2.61 (s, 3H), 2.62 (m, 3H), 3.48 (m, 1H), 4.20 (m, 2H), 7.24 (br s, 2H), 7.48-7.52 (m, 2H), 7.63 (s, 1H), 7.84 (m, 1H), 7.93 (m, 2H), 8.37 (m, 2H), 8.81 (br s, 2H) and 8.97 (s, 1H) ppm; MS (ES⁺) 478.3

The following compounds were all prepared using a method similar to the one described for Compound IIA-12 above.

Compound IIA-13: 3-[3-[3-chloro-4-(methylaminomethyl)phenyl]isoxazol-5-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.19 (m, 6H), 2.71 (s, 3H), 3.48 (m, 1H), 4.37 (s, 2H), 7.24 (br s, 2H), 7.79 (m, 1H), 7.95 (m, 2H), 8.12 (m, 1H), 8.25 (m, 1H), 8.38 (m, 2H) and 8.98 (br s, 2H) ppm; MS (ES⁺) 498.25

Compound IIA-14: 3-[3-[2-fluoro-4-(methylaminomethyl)phenyl]isoxazol-5-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.18 (m, 6H), 2.63 (m, 3H), 3.47 (m, 1H), 4.26 (m, 2H), 7.26 (br s, 2H), 7.51 (m, 1H), 7.60 (m, 1H), 7.65 (m, 1H), 7.94 (m, 2H), 8.13 (t, 1H), 8.36 (m, 2H), 8.88 (br s, 2H) and 8.98 (s, 1H) ppm; MS (ES⁺) 482.0

Compound IIA-15: 3-[3-[2-chloro-4-(methylaminomethyl)phenyl]isoxazol-5-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.18 (d, 6H), 2.63 (t, 3H), 3.49 (m, 1H), 4.26 (m, 2H), 7.25 (br s, 2H), 7.63-7.65 (m, 2H), 7.85 (m, 1H), 7.93 (m, 3H), 8.36 (m, 2H), 8.87 (br s, 2H) and 8.98 (s, 1H) ppm; MS (ES⁺) 498.2

Example 66A: 5-(4-(ethylsulfonyl)phenyl)-3-(5-(3-((methylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (Compound IA-307)

Compound IA-307 was prepared using Method IV-AJ, Step 1, followed by Method IV-AAM, Steps 1-3.

Method IV-AAM Step 1: 5-bromo-3-(5-(4-(bromomethyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

Dibromo(triphenyl)phosphorane (37.29 g, 88.35 mmol) was added to a suspension of 4-(bromomethyl)benzoic acid (4.318 g, 20.08 mmol) and 3-amino-6-bromo-pyrazine-2-carbohydrazide (4.66 g, 20.08 mmol) in acetonitrile (143.4 mL). The resulting mixture was stirred at room temperature for 2 h and then Hunig's base (15.57 g, 20.98 mL, 120.5 mmol) was added and the reaction was stirred overnight. Exotherm observed during Hunig's base addition; moderated with ice bath (temp. kept around 20+/−4). The reaction mixture was filtered and the solid obtained washed with cold acetonitrile to leave the product as a yellow solid (5.45 g, 66.7% yield); 1H NMR (400.0 MHz, DMSO) δ 4.82 (s, 2H), 7.72 (d, 2H), 7.80 (s, 1H), 8.11 (d, 2H) and 8.45 (s, 1H) ppm; MS (ES⁺) 412.1.

Step 2: 5-bromo-3-(5-(4-((methylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

5-bromo-3-(5-(4-(bromomethyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (100 mg, 0.2433 mmol) and Na₂CO₃ (77.36 mg, 0.7299 mmol) were suspended in and treated with methylamine (182.4 μL of 2 M, 0.36 mmol). The reaction was heated at 60° C. for 10 min and then additional methylamine (426.0 μL of 2 M, 0.86 mmol) was then added and the reaction heated at 60° C. or another 10 min. The reaction was cooled, diluted with water (5 mL) and extracted into dichloromethane (3×5 mL). The organic layer was dried over Na₂SO₄, filtered and concentrated in vacuo to yield 5-bromo-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (74.7 mg, 85.34% yield) as a yellow solid; MS (ES⁺) 362.3

Step 3: 5-(4-(ethylsulfonyl)phenyl)-3-(5-(4-((methylamino)methyl)phenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

To a 0.5-2.0 mL microwave vial 5-bromo-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (100 mg, 0.24 mmol), 4-(ethylsulfonyl)phenylboronic acid (56.72 mg, 0.265 mmol), dioxane (1 mL) and aqueous solution of Na₂CO₃ (361.3 μL of 2M solution, 0.72 mmol) were added. Palladium; triphenylphosphane (13.91 mg, 0.012 mmol) was then added and the vial sealed. The reaction mixture was heated in the microwave at 150° C. for 30 min. After this time the reaction mixture was diluted with DMSO (2 mL) and filtered before purification by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were collected and evaporated to dryness to give the product as a yellow solid (64.35 mg, 65% yield); 1H NMR (400.0 MHz, DMSO) δ 1.14 (t, 3H), 2.64 (s, 3H), 3.33-3.39 (m, 2H), 4.29 (s, 2H), 7.77 (d, 2H), 8.02 (d, 2H), 8.26 (d, 2H), 8.41 (d, 2H), 8.93 (s, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 451.0

The following compounds were all prepared using a method similar to the one described for Compound IA-307 above.

Compound IA-289: 5-[4-(2-dimethylaminoethylsulfonyl)phenyl]-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine MS (ES⁺) 494.0

Compound IA-296: 4-[5-amino-6-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzenesulfonamide 1H NMR (400.0 MHz, DMSO) δ 2.64 (t, 3H), 2.67 (s, 6H), 4.28-4.30 (m, 2H), 7.76 (d, 2H), 7.88 (d, 2H), 8.26 (d, 2H), 8.40 (d, 2H), 8.92 (s, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 466.0

Compound IA-297: 5-[4-(azetidin-1-ylsulfonyl)phenyl]-3-[5-[4-(methylaminomethyl) phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 2.01 (td, 2H), 2.64 (s, 3H), 3.72 (t, 4H), 4.29 (s, 2H), 7.77 (d, 2H), 7.94 (d, 2H), 8.26 (d, 2H), 8.45 (d, 2H), 8.94 (s, 2H) and 9.10 (s, 1H) ppm; MS (ES⁺) 478.0

Compound IA-301: 3-[4-[5-amino-6-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]phenyl]sulfonylpropan-1-ol 1H NMR (400.0 MHz, DMSO) δ 1.71 (dd, 2H), 2.64 (s, 3H), 3.28-3.45 (m, 4H), 4.29 (s, 2H), 4.68 (s, 1H), 7.77 (d, 2H), 8.02 (d, 2H), 8.27 (d, 2H), 8.41 (d, 2H), 8.90 (s, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 481.0

Compound IA-302: 3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-tetrahydrofuran-3-ylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 2.14-2.20 (m, 2H), 2.64 (s, 3H), 3.66 (dd, 1H), 3.77 (dd, 1H), 3.86 (dd, 1H), 4.05 (dd, 1H), 4.23-4.26 (m, 1H), 4.29 (s, 2H), 7.77 (d, 2H), 8.05 (d, 2H), 8.26 (d, 2H), 8.42 (d, 2H), 8.94 (s, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 493.0

Compound IA-304: 4-[5-amino-6-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]-N-(2-hydroxyethyl)benzenesulfonamide 1H NMR (400.0 MHz, DMSO) δ 2.63 (d, 3H), 2.84 (q, 2H), 3.39 (t, 2H), 4.29 (s, 2H), 7.74 (q, 1H), 7.78 (s, 2H), 7.93 (d, 2H), 8.26 (d, 2H), 8.34 (d, 2H), 8.99 (s, 2H) and 9.05 (s, 1H) ppm; MS (ES⁺) 482.0

Compound IA-308: 3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-[4-(oxetan-3-ylsulfonyl)phenyl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 2.64 (s, 3H), 4.29 (s, 2H), 4.77-4.82 (m, 4H), 4.96 (s, 1H), 7.77 (d, 2H), 8.05 (d, 2H), 8.26 (d, 2H), 8.41-8.43 (m, 2H), 8.89 (s, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 479.0

Compound IA-310: 3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-propylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 0.94 (t, 3H), 1.60 (q, 2H), 2.64 (s, 3H), 3.32-3.36 (m, 1H), 4.29 (s, 2H), 7.77 (d, 2H), 8.02 (d, 2H), 8.26 (d, 2H), 8.39-8.41 (m, 2H), 8.95 (d, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 465.0

Compound IA-313: 3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-sec-butylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 0.94 (t, 3H), 1.19 (d, 3H), 1.32-1.40 (m, 1H), 1.89-1.83 (m, 1H), 2.28 (d, 3H), 3.26-3.31 (m, 1H), 3.76 (s, 2H), 7.61 (d, 2H), 7.98 (d, 2H), 8.12 (d, 2H), 8.40 (d, 2H) and 9.06 (s, 1H) ppm; MS (ES⁺) 479.0

Compound IA-288: 3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-methylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 2.64 (s, 3H), 3.29 (s, 3H), 4.29 (s, 2H), 7.77 (d, 2H), 8.06 (d, 2H), 8.26 (d, 2H), 8.39-8.41 (m, 2H), 8.92 (s, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 437.0

Compound IA-323: 3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-tetrahydropyran-4-ylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.52-1.63 (m, 2H), 11.78 (d, 2H), 2.64 (t, 3H), 3.30 (dd, 2H), 3.57-3.64 (m, 1H), 3.92 (dd, 2H), 4.28-4.30 (m, 2H), 7.77 (d, 2H), 7.98 (d, 2H), 8.26 (d, 2H), 8.41-8.43 (m, 2H), 8.91 (s, 2H) and 9.01 (s, 1H) ppm; MS (ES⁺) 507

Compound IA-324: 5-[4-[2-(dimethylamino)-1-methyl-ethyl]sulfonylphenyl]-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.30 (d, 3H), 2.64 (s, 3H), 2.81 (s, 3H), 2.90 (s, 3H), 3.35 (s, 1H), 3.56 (s, 1H), 4.09 (s, 1H), 4.29 (s, 2H), 7.77 (d, 2H), 7.90-7.97 (m, 2H), 8.06 (d, 2H), 8.25 (d, 2H), 8.47 (d, 2H), 9.03 (s, 2H), 9.13 (s, 1H) and 9.65 (s, 1H) ppm; MS (ES⁺) 508

Compound IA-328: 4-[4-[5-amino-6-[5-[2-fluoro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]phenyl]sulfonyl-2-methyl-pentan-2-ol MS (ES⁺) 541

Compound IA-332: 3-[5-[2-fluoro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-[4-(3-methoxy-1-methyl-propyl)sulfonylphenyl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.24 (d, 3H), 1.51-1.57 (m, 1H), 2.07-2.14 (m, 1H), 2.67 (s, 3H), 3.22 (s, 3H), 3.40-3.45 (m, 3H), 4.33 (s, 2H), 7.62 (m, 1H), 7.72 (d, 1H), 8.02 (d, 2H), 8.31 (t, 1H), 8.40 (d, 2H), 9.06 (s, 2H) and 9.12 (s, 1H) ppm; MS (ES⁺) 528

Compound IA-338: 3-[5-[2-fluoro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-sec-butylsulfonylphenyl)pyrazin-2-amine MS (ES⁺) 497

Compound IA-344: 3-[5-[2-fluoro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-tetrahydropyran-4-ylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.52-1.63 (m, 2H), 1.77 (d, 2H), 2.64 (s, 3H), 3.30 (dd, 2H), 3.56-3.64 (m, 1H), 3.92 (dd, 2H), 4.31 (s, 2H), 7.60 (dd, 1H), 7.68-7.70 (m, 1H), 7.98 (d, 2H), 8.28 (t, 1H), 8.37-8.39 (m, 1H), 8.98 (s, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 525

Compound IA-347: 3-[5-[2-fluoro-4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-tetrahydrofuran-3-ylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 2.13-2.20 (m, 2H), 2.64 (s, 3H), 3.66 (dd, 1H), 3.74-3.80 (m, 1H), 3.86 (m, 1H), 4.04 (m, 1H), 4.22-4.28 (m, 1H), 4.31 (s, 2H), 7.60 (dd, 1H), 7.69 (d, 1H), 8.05 (d, 2H), 8.29 (t, 1H), 8.38 (d, 2H), 8.96 (s, 2H) and 9.10 (s, 1H) ppm; MS (ES⁺) 511

Compound IA-330: 5-[4-(3-methoxy-1-methyl-propyl)sulfonylphenyl]-3-[5-[4-(methylaminomethyl)phenyl]-1,3,4-oxadiazol-2-yl]pyrazin-2-amine MS (ES⁺) 509

Example 67A: 2-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-5-(methylaminomethyl)phenol (Compound IA-291)

Compound IA-291 was prepared using Method IV-C, Steps 1-2, followed by Method IV-AR, Steps 1-2, followed by Method IV-AAN, Step 1.

Method IV-AAN Step 1: 2-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-5-(methylaminomethyl)phenol

To a solution of tert-butyl N-[[4-[5-[3-amino-6-(4-isopropylsulfonylphenyl) pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-3-chloro-phenyl]methyl]-N-methyl-carbamate (130 mg, 0.2170 mmol) in dioxane (3 mL) was added of 1,5-diphenylpenta-1,4-dien-3-one; palladium (6.239 mg, 0.01085 mmol), di-tert-butyl-[2-(2,4,6-triisopropylphenyl)phenyl]phosphane (13.82 mg, 0.03255 mmol) and potassium hydroxide (434.0 μL of 1 M, 0.4340 mmol). The resulting mixture was heated to 100° C. for 2 h. Additional 1,5-diphenylpenta-1,4-dien-3-one; palladium (6.239 mg, 0.01085 mmol), ditert-butyl-[2-(2,4,6-triisopropylphenyl)phenyl]phosphane (13.82 mg, 0.03255 mmol) and potassium hydroxide (434.0 μL of 1 M, 0.4340 mmol) were added and the resulting mixture heated for a further 2 h at 100° C. The reaction mixture was evaporated to dryness and the residue purified by column chromatography on silica eluting with 20% EtOAc/petroleum ether. Product fractions were combined and concentrated in vacuo. This mixture was dissolved in DCM (10 mL) and TFA (247.4 mg, 167.2 μL, 2.170 mmol) added. The resulting mixture was stirred at room temperature for 1 h and then concentrated in vacuo to an oil. This was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were collected and lyopholised to give the product as a yellow solid (24.0 mg, 18% yield); 1H NMR (400.0 MHz, DMSO) δ 1.31 (m, 6H), 2.80 (s, 3H), 3.43 (m, 1H), 4.27 (s, 2H), 7.23 (m, 1H), 7.30 (m, 1H), 8.04 (m, 2H), 8.19 (m, 1H), 8.41 (m, 2H) and 8.95 (s, 1H) ppm; MS (ES+) 481.2

The following compounds were all prepared using a method similar to the one described for Compound I-291 above.

Compound I-320: 5-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]-2-(methylaminomethyl)phenol 1H NMR (400.0 MHz, DMSO) δ 1.3 (d, 6H), 2.7 (s, 3H), 3.4-3.5 (m, 1H), 4.45 (s, 2H), 7.7 (d, 1H), 7.8-7.83 (m, 2H), 8.05 (d, 2H), 8.4 (d, 2H) and 8.95 (s, 1H) ppm; MS (ES⁺) 481.2

Example 67A: 2-[5-amino-6-(5-phenyl-1,3,4-thiadiazol-2-yl)pyrazin-2-yl]-5-(1,4-diazepane-1-carbonyl)benzonitrile (Compound IV-2)

Compound IVA-2 was prepared using Method IV-D, Step 1, followed by Method IV-AAO, Step 1.

Method IV-AAO Step 1: 2-[5-amino-6-(5-phenyl-1,3,4-thiadiazol-2-yl)pyrazin-2-yl]-5-(1,4-diazepane-1-carbonyl)benzonitrile

A mixture of methyl 4-bromo-3-cyano-benzoate (100 mg, 0.4166 mmol), potassium acetate (122.7 mg, 1.250 mmol), 4,4,5,5-tetramethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane (158.7 mg, 0.6249 mmol) and 1-cyclopenta-1,4-dienyl-diphenyl-phosphane; dichloromethane; dichloropalladium; iron (34.02 mg, 0.04166 mmol) was heated in dioxane (10 mL) at 80° C. for 2 h. After this time, the reaction mixture was cooled and palladium; triphenylphosphane (48.14 mg, 0.04166 mmol), sodium carbonate (625.0 μL of 2 M, 1.250 mmol) and 5-bromo-3-(5-phenyl-1,3,4-thiadiazol-2-yl)pyrazin-2-amine (139.2 mg, 0.4166 mmol) were added and heated at 140° C. under microwave conditions for 1 h. After cooling to room temperature, the resulting carboxylic acid was filtered off as brown solid. The solid was dissolved in DMF (3 mL) and 1,4-diazepane (208.3 mg, 2.083 mmol) and TBTU (267.5 mg, 0.8332 mmol) were added. The resulting mixture was stirred at room temperature for 2 h then diluted with ethyl acetate (5 mL), and the organic extract washed with water (1×5 mL) and brine (1×5 mL), dried over MgSO₄ and concentrated in vacuo to a solid. This solid was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were collected and lyopholised to give the product as a yellow solid (60 mg, 25% yield); 1H NMR (400.0 MHz, DMSO) δ 1.9-2.1 (m, 2H), 3.3-3.4 (m, 4H), 3.5-3.55 (m, 2H), 3.65-3.7 (m, 1H), 3.7-3.75 (m, 1H), 3.8-3.9 (m, 2H), 7.5-7.6 (m, 3H), 7.8 (d, 1H), 8.1-8.22 (m, 3H), 8.25 (br s, 1H), 8.75 (br s, 2H) and 8.8 (s, 1H) ppm; MS (ES⁺) 483.2

The following compounds were all prepared using a method similar to the one described for Compound IVA-2 above.

Compound IVA-1: 4-[5-amino-6-(5-phenyl-1,3,4-thiadiazol-2-yl)pyrazin-2-yl]-3-cyano-N,N-dimethyl-benzamide 1H NMR (400.0 MHz, DMSO) δ 3.0 (d, 6H), 7.6-7.65 (m, 3H), 7.85 (d, 1H), 8.1-8.2 (m, 4H), 8.25 (br s, 1H) and 8.8 (s, 1H) ppm; MS (ES⁺) 428.1

Example 68A: 4-[5-amino-6-[5-(2-cyanoanilino)-1,3,4-thiadiazol-2-yl]pyrazin-2-yl]-N,N-dimethyl-benzamide (Compound IVA-3)

Compound IVA-3 was prepared using Method IV-C, Steps 1-2, followed by Method IV-AAP, Step 1.

Method IV-AAP Step 1: 2-[5-amino-6-(5-phenyl-1,3,4-thiadiazol-2-yl)pyrazin-2-yl]-5-(1,4-diazepane-1-carbonyl)benzonitrile

A mixture of 4-(5-amino-6-(hydrazinecarbonyl)pyrazin-2-yl)-N,N-dimethylbenzamide (75 mg, 0.2373 mmol), 2-isothiocyanatobenzonitrile (38.01 mg, 0.2373 mmol) in CH₂Cl₂(1.425 mL) was stirred at room temperature for 2 h. Ether was added and the reaction mixture filtered to give a yellow solid. This was taken up in anhydrous acetonitrile (1.5 mL) and then cooled in an ice bath. DIPEA (92.01 mg, 124.0 μL, 0.7119 mmol) was added, followed by portionwise addition of dibromo(triphenyl)phosphorane (130.2 mg, 0.3085 mmol). The resulting mixture was stirred at room temperature overnight and then heated under reflux for 1 h. The reaction mixture was cooled to room temperature and then filtered. The solid was washed further with acetonitrile (5 mL) and dried under vacuum to give the product as a bright yellow solid (68.0 mg, 62% yield); 1H NMR (400.0 MHz, DMSO) δ 3.01 (d, 6H), 5.76 (s, 2H), 7.55-7.60 (m, 3H), 7.73 (d, 1H), 7.83-7.87 (m, 2H), 8.18 (d, 2H), 8.43-8.45 (m, 1H) and 8.91 (s, 1H) ppm; MS (ES⁺) 443.17

Example 69A: 3-[3-[2-fluoro-4-(methylaminomethyl)phenyl]isoxazol-5-yl]-5-(4-tetrahydrofuran-3-ylsulfonylphenyl)pyrazin-2-amine (Compound IIA-16)

Compound IIA-16 was prepared using Method IV-F, Steps 1-2, followed by Method IV-AAD, Steps 1-2, followed by Method IV-AAQ, Step 1.

Method IV-AAQ Step 1: 3-[3-[2-fluoro-4-(methylaminomethyl)phenyl]isoxazol-5-yl]-5-(4-tetrahydrofuran-3-ylsulfonylphenyl)pyrazin-2-amine

TFA (281.6 mg, 190.3 μL, 2.470 mmol) was added to a solution of tert-butyl N-[[4-[5-[3-[bis(tert-butoxycarbonyl)amino]-6-(4-tetrahydrofuran-3-ylsulfonylphenyl)pyrazin-2-yl]isoxazol-3-yl]-3-fluoro-phenyl]methyl]-N-methyl-carbamate (100 mg, 0.1235 mmol) in dichloromethane (2.069 mL) at room temperature and the resulting solution stirred for 2 h. The reaction mixture was concentrated in vacuo and purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were collected and lyopholised to give the product as a yellow solid (34.0 mg, 44% yield); 1H NMR (400.0 MHz, DMSO) δ 2.13-2.19 (m, 2H), 2.63 (m, 3H), 3.66 (m, 1H), 3.76 (m, 1H), 3.85 (m, 1H), 4.04 (m, 1H), 4.21-4.28 (m, 3H), 7.27 (m, 2H), 7.52 (m, 1H), 7.60-7.65 (m, 2H), 8.00 (m, 2H), 8.12 (t, 1H), 8.36 (m, 2H) and 8.94 (m, 3H) ppm; MS (ES⁺) 510.2

Example 70A: 3-[5-[4-[(1S)-1-amino-2,2,2-trifluoro-ethyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine (Compound IA-325)

Compound IA-325 was prepared using Method IV-B, Steps 1-4, followed by Method IV-AAR, Step 1.

Method IV-AAR Step 1: 3-[5-[4-[(1S)-1-amino-2,2,2-trifluoro-ethyl]phenyl]-1,3,4-oxadiazol-2-yl]-5-(4-isopropylsulfonylphenyl)pyrazin-2-amine

HCl (35.27 μL of 3 M, 0.1058 mmol) was added to a solution of N-[(1S)-1-[4-[5-[3-amino-6-(4-isopropylsulfonylphenyl)pyrazin-2-yl]-1,3,4-oxadiazol-2-yl]phenyl]-2,2,2-trifluoro-ethyl]-2-methyl-propane-2-sulfinamide (253.3 mg, 0.05288 mmol) in MeOH (1 mL) and the resulting solution stirred at room temperature overnight. The reaction mixture was concentrated to dryness under reduced pressure and the residue triturated with acetonitrile and filtered. The solid was taken up in a mixture of acetonitrile/water/MeOH and passed through the bicarbonate cartridge. The eluent was concentrated in vacuo and then triturated with acetonitrile to give the product as a yellow solid (26 mg, 99% yield); 1H NMR (400.0 MHz, DMSO) δ 1.20 (d, 6H), 2.68 (d, 2H), 3.41-3.51 (m, 1H), 4.65-4.75 (m, 1H), 7.81 (d, 2H), 7.98 (d, 2H), 8.20 (d, 2H), 8.41 (d, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 519.1

Example 71A: 5-[4-[2-(dimethylamino)-1-methyl-ethyl]sulfonylphenyl]-3-[5-(2-fluorophenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine (Compound IA-337)

Compound IA-337 was prepared using Method IV-AAS, Steps 1-2.

Method IV-AAS Step 1: 5-bromo-3-(5-(2-fluorophenyl)-1,3,4-oxadiazol-2-yl)pyrazin-2-amine

To a suspension of 2-fluorobenzohydrazide (2 g, 12.98 mmol), 3-amino-6-bromo-pyrazine-2-carboxylic acid (2.830 g, 12.98 mmol), and TBTU (5.002 g, 15.58 mmol) in DMF (20.00 mL) was added DIPEA (3.691 g, 4.974 mL, 28.56 mmol). The resulting mixture was stirred at room temperature for 2 h. The reaction mixture was diluted with water (20 mL) and extracted with EtOAc (3×20 mL), the combined organic extracts were washed with water (3×20 mL) and brine (1×20 mL), dried over MgSO₄ and concentrated in vacuo. The residue was then triturated with acetonitrile and filtered and dried to give 3-amino-6-bromo-N′-(2-fluorophenylcarbonyl)pyrazine-2-carbohydrazide as an orange solid. This was taken up in MeCN (20.00 mL) and added bromo(triphenyl)phosphonium (5.331 g, 15.58 mmol) was added followed by DIPEA (3.691 g, 4.974 mL, 28.56 mmol). The reaction mixture was stirred for 30 min, and then filtered. The solid was washed with acetonitrile to give the product as a yellow solid (1.46 g, 67%); 1H NMR (400 MHz, DMSO) δ 7.48-7.54 (m, 2H), 7.75 (m, 3H), 8.12 (m, 1H) and 8.45 (m, 1H) ppm; MS (ES⁺) 338.03

Step 2: 5-[4-[2-(dimethylamino)-1-methyl-ethyl]sulfonylphenyl]-3-[5-(2-fluorophenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine

2-(4-bromophenyl)sulfonyl-N,N-dimethyl-propan-1-amine (100 mg, 0.3233 mmol) was dissolved in dioxane (1.774 mL) and Bis(pinacolato)diboron (123.6 mg, 0.4866 mmol) and potassium acetate (95.50 mg, 0.9731 mmol) were added. The reaction was degassed and filled with nitrogen five times then Pd(dppf)Cl₂.DCM (26.40 mg, 0.03233 mmol) was added and the reaction heated to 90° C. for 2 h. The reaction mixture was cooled to room temperature and N₂ bubbled through for 10 min. Then 5-bromo-3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyrazin-2-amine (102.9 mg, 0.3233 mmol) and an aqueous solution of Na₂CO₃ (485.0 μL of 2 M, 0.9699 mmol) was added. N₂ was bubbled through for a further 10 min then Pd(PPh₃)₄(37.47 mg, 0.03243 mmol) was added and the reaction mixture heated under microwave conditions at 150° C. for 30 min. The reaction mixture was passed through an SCX-2 cartridge eluting with MeCN/MeOH, washing with 200 mL, followed by 2M NH₃ in MeOH with MeCN to elute the compound. Evaporation of the solvent gave a brown solid which was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were collected and lyopholised to give the product as a yellow solid (67.1 mg, 33% yield); 1H NMR (400.0 MHz, DMSO) δ 1.29 (d, 3H), 2.80 (s, 3H), 2.90 (s, 3H), 3.35 (d, 1H), 3.48 (d, 1H), 4.09 (s, 1H), 7.50-7.60 (m, 2H), 7.76-7.81 (m, 1H), 8.06 (d, 2H), 8.20 (m, 1H), 8.43 (d, 2H), 9.12 (s, 1H) and 9.41 (s, 1H) ppm; MS (ES⁺) 483

The following compounds were all prepared using a method similar to the one described for Compound IA-337 above.

Compound IA-327: 3-[5-(2-fluorophenyl)-1,3,4-oxadiazol-2-yl]-5-(4-tetrahydropyran-4-ylsulfonylphenyl)pyrazin-2-amine MS (ES⁺) 482

Compound IA-339: 3-[4-[5-amino-6-[5-(2-fluorophenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-yl]phenyl]sulfonylbutan-1-ol 1H NMR (400.0 MHz, DMSO) δ 1.20 (d, 3H), 1.37-1.46 (m, 1H), 1.99-2.02 (m, 1H), 3.38-3.43 (m, 2H), 3.52 (s, 1H), 4.66 (t, 1H), 7.50-7.59 (m, 2H), 7.77 (d, 1H), 7.97 (d, 2H), 8.20 (s, 1H), 8.37 (d, 2H) and 9.08 (s, 1H) ppm; MS (ES⁺) 470

Compound IA-343: 5-[4-[3-(dimethylamino)-1-methyl-propyl]sulfonylphenyl]-3-[5-(2-fluorophenyl)-1,3,4-oxadiazol-2-yl]pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 1.20 (d, 3H), 1.76-1.82 (m, 1H), 2.14-2.20 (m, 1H), 2.79 (s, 6H), 3.21 (s, 2H), 3.47-3.55 (m, 1H), 7.50-7.59 (m, 2H), 7.75-7.81 (m, 1H), 8.01 (d, 2H), 8.19 (m, 1H), 8.40 (d, 2H), 9.10 (s, 1H) and 9.58 (s, 1H) ppm; MS (ES⁺) 497

Compound IA-349: 3-[5-(2-fluorophenyl)-1,3,4-oxadiazol-2-yl]-5-(4-tetrahydrofuran-3-ylsulfonylphenyl)pyrazin-2-amine 1H NMR (400.0 MHz, DMSO) δ 2.13-2.19 (m, 2H), 3.65 (m, 1H), 3.74-3.80 (m, 1H), 3.86 (dd, 1H), 4.04 (dd, 1H), 4.22-4.28 (m, 1H), 7.50-7.60 (m, 2H), 7.75-7.80 (m, 1H), 8.04 (d, 2H), 8.20 (m, 1H0, 8.38 (d, 2H) and 9.09 (s, 1H) ppm; MS (ES⁺) 468

Example 72A: 3-(3-(4-((dimethylamino)methyl)-2-fluorophenyl)isoxazol-5-yl)-5-(3-fluoro-4-(isopropyl sulfonyl)phenyl)pyrazin-2-amine (Compound IIA-17)

Compound IIA-17 was prepared using Method IV-F, Steps 1-4, followed by Method IV-AAT, Step 1.

tert-Butyl N-[[4-[5-[3-[bis(tert-butoxycarbonyl)amino]-6-bromo-pyrazin-2-yl]isoxazol-3-yl]-3-fluoro-phenyl]methyl]-N-methyl-carbamate (150 mg, 0.2211 mmol), 2-(3-fluoro-4-isopropylsulfonyl-phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (72.57 mg, 0.2211 mmol) and Na₂CO₃ (46.87 mg, 0.4422 mmol) suspended in MeCN (2.486 mL)/water (2.486 mL). Mixture de-gassed (×5 N₂-vacuum cycles) and Pd(PPh₃)₄(25.55 mg, 0.02211 mmol) added. Mixture de-gassed again and the reaction mixture was heated at 90° C. under microwave conditions for 20 min. The reaction mixture was diluted with water (5 mL) and ethyl acetate (5 mL) and the layers separated. The aqueous layer was extracted further with ethyl acetate (2×10 mL) and the combined organic extracts dried over MgSO₄ and concentrated in vacuo. The residue was taken up in dichloromethane (3 mL) and TFA (504.2 mg, 340.7 μL, 4.422 mmol) was added. The resulting solution was stirred at room temperature for 4 h and then concentrated in vacuo. The residue was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH₃CN) over 16 minutes at 25 mL/min]. The product fractions were collected and lyopholised to give the product as a yellow solid (47.5 mg, 45% yield); MS (ES⁺) 500.1

Compounds P73 to P144, P145, P147-P148 and P150 can be made using a methodology similar to the one described in Method AAT.

The compounds of Table A were synthesized using the methods described herein as well as those known in the art. More specifically, the compounds were made using one or more of the following methods: Oxadiazolyl compounds (Formula IA compounds) can be made according to methods described in Schemes I-B2 and I-B3; Isoxazolyl compounds (Formula IIA compounds) can be made according to methods described in Schemes I-E1 and I-E2. Triazolyl compounds (Formula IIIA) can be made according to methods described in Schemes I-F1 and I-F2.

TABLE A Patent LCMS LCMS Cmpd (M + 1) Rt (min) HNMR IA-1 442.02 3.12 (DMSO) 1.90 (2H, m), 3.10 (4H, m), 3.34 (2H, m), 3.34-3.70 (2H, m), 7.46 (2H, m), 7.53-7.57 (3H, m), 7.66 (1H, br s), 8.02-8.07 (4H, m), 8.58 (2H, br s), 8.86 (1H, s) IA-2 442.02 3.2 (DMSO) 1.96-2.04 (2H, m), 3.25-3.85 (8H, m - with water signal), 7.47 (2H, br s), 7.60 (2H, m), 7.71 (2H, m), 7.79 (1H, m), 8.16 (2H, m), 8.29 (2H, m), 8.77 (2H, m), 8.97 (1H, s) IA-4 488.31 2.49 — IA-5 474.29 2.46 1.78 (1H, m), 2.02 (1H, m), 2.73 (1H, m), 3.11-3.50 (3H, m), 3.68-3.79 (1H, m), 7.58 (1H, m), 7.68 (3H, m), 7.88 (2H, br hump), 8.00 (2H, m), 8.19 (2H, m), 9.03 (1H, m) IA-6 460.23 2.47 dmso d6 1.581H, m), 1.76 (1H, m), 2.69-2.89 (4H, m), 3.28-3.41 (2H, m), 3.62 + 3.68 (2H, 2 × m), 7.54 (1H, m), 7.70 (3H, m), 7.89 (2H, br hump(, 8.03 (2H, m), 8.18 (2H, m), 9.03 (1H, d) IA-7 446.21 2.45 — IA-8 596.15 3.77 dmso d6 1.21 + 1.25 (6H, 2 × t), 1.60 + 1.83 (2H, 2 × m), 3.15-3.41 (4H, m), 3.72 (2H, m), 3.90 (2H, 2 × q), 7.54 (1H, m), 7.70 (3H, m), 8.04 (2H, m), 8.18 (2H, m), 9.03 (1H, s) IA-9 442.2 2.42 — IA-10 456.16 3.4 — IA-11 500.17 3.6 — IA-12 428.13 3.1 — IA-13 429.07 3.17 dmso d6 3.32-3.62 (8H, m), 7.57 (2H, d), 7.69 (3H, m), 7.81 (2H, br s), 8.18 (4H, m), 9.00 (1H, s) IA-14 431.1 3.27 — IA-15 443.09 3.18 — IA-16 496.08 2.79 — IA-17 442.12 2.46 — IA-18 456.15 2.51 — IA-19 567.22 3.68 CDCl3 1.18 (1H, m), 1.36 (1H, m), 1.70 (1H, m), 1.93 (1H, m), 3.35-3.53 (5H, m), 3.59 (1H, m), 3.67 (1H, m), 3.77 (1H, m), 7.49 (3H, m), 7.66 (1H, m), 7.80 (1H, s), 7.87 (1H, m), 8.21 (2H, m), 8.64 (1H, m) IA-20 467.22 2.93 dmso d6 1.60 (1H, m), 1.76 (1H, m), 2.68-2.89 (3H, m), 3.34-3.41 (2H, m), 3.61-3.68 (2H, m), 7.65-7.70 (3H, m), 7.83 (1H, d), 7.92 (1H, d), 8.10-8.20 (3H, m), 8.91 (1H, s) IA-21 506 2.58 H NMR (400.0 MHz, DMSO) d 9.61 (s, 1H), 9.08 (s, 1H), 8.21-8.18 (m, 2H), 7.98 (d, J = 9.8 Hz, 2H), 7.72-7.67 (m, 4H), 4.69 (d, J = 11.6 Hz, 1H), 3.67 (d, J = 12.9 Hz, 1H), 3.54 (t, J = 6.1 Hz, 1H), 3.23-3.15 (m, 1H), 2.91-2.85 (m, 1H), 2.79 (s, 6H), 2.17 (d, J = 11.1 Hz, 1H), 2.05 (d, J = 12.6 Hz, 1H), 1.57 (dd, J = 4.2, 12.4 Hz, 1H) and 1.48 (dd, J = 3.8, 12.0 Hz, 1H) ppm IA-22 538 2.6 H NMR (400.0 MHz, DMSO) d 9.57 (s, 1H), 8.52 (s, 1H), 8.08-8.06 (m, 2H), 7.95 (s, 1H), 7.88-7.82 (m, 3H), 7.71-7.62 (m, 3H), 4.70 (s, 1H), 3.74 (s, 1H), 3.49 (s, 1H), 3.19 (s, 1H), 2.79 (s, 3H), 2.77 (s, 3H), 2.68 (t, J = 1.8 Hz, 1H), 2.09 (s, 1H), 1.91 (s, 1H) and 1.71-1.66 (m, 2H) ppm IA-23 387.13 3.48 (DMSO) 2.98 (6H, m), 7.55 (2H, m), 7.69-7.71 (3H, m), 7.83 (2H, br s), 8.17-8.20 (4H, m), 9.00 (1H, s) IA-24 464 2.68 H NMR (400.0 MHz, DMSO) d 9.09 (s, 1H), 8.43 (d, J = 8.6 Hz, 3H), 8.19-8.17 (m, 2H), 7.92 (d, J = 8.5 Hz, 2H), 7.71 (dd, J = 4.5, 7.0 Hz, 2H), 7.69 (s, 1H), 3.21 (d, J = 5.0 Hz, 4H) and 3.15 (s, 4H) ppm IA-25 492 2.68 — IA-26 439 3.06 H NMR (400.0 MHz, DMSO) d 9.10 (s, 1H), 8.39 (dd, J = 1.6, 7.0 Hz, 2H), 8.27-8.24 (m, 2H), 7.99 (d, J = 8.5 Hz, 2H), 7.78-7.74 (m, 4H), 4.78 (t, J = 5.6 Hz, 1H), 3.45 (q, J = 6.1 Hz, 2H) and 2.90 (t, J = 6.1 Hz, 2H) ppm IA-27 526.2 2.83 dmso d6 0.85 + 0.90 (9H, 2 × s), 1.29 + 1.38 (2H, 2 × t), 1.71 + 1.83 (2H, 2 × m), 2.39-2.72 (6H, m), 3.41 (2H, m), 3.65 (2H, m), 7.52 (2H, m), 7.69 (3H, m), 7.80 (2H, br s), 8.18 (4H, m), 8.99 (1H, s) IA-28 542.17 3.67 1.44 (9H, s), 1.59 (1H, m), 1.80 (1H, m), 3.32-3.40 (4H, m), 3.37-3.43 (2H, m), 3.63 (1H, m), 3.73 (1H, m), 7.45-7.54 (2H, m), 7.66-7.73 (3H, m), 7.80 (2H, br s), 8.16-8.20 (4H, m), 9.00 (1H, s) IA-29 470.1 2.92 1.58 (1H, m), 1.83 (1H, m), 3.32-3.65 (7H, m), 3.79 (1H, m), 7.45-7.50 (2H, m), 7.67-7.71 (3H, m), 7.80 (2H, br s), 8.04 (1H, m), 8.14-8.20 (4H, m), 9.00 (1H, s) IA-30 405.11 3.42 (DMSO) 2.97 (6H, m), 7.50-7.60 (4H, m), 7.75-7.80 (2H, m), 8.15-8.21 (3H, m), 9.01 (1H, s) IA-31 540.2 3.52 dmso d6 1.01, 1.02 (9H, 2 × s), 1.54, 1.83 (2H, 2 × m), 2.25, m, 3.32-3.79 (8H, m), 7.43-7.52 (2H, m), 7.68-7.73 (3H, m), 7.80 (2H, br s), 8.14-8.20 (4H, m), 9.00 (1H, s) IA-32 402.13 3.34 H NMR (400.0 MHz, DMSO) d 2.97 (s, 3H), 3.01 (s, 3H), 7.06 (d, J = 7.4 Hz, 1H), 7.38-7.42 (m, 2H), 7.54-7.56 (m, 2H), 7.68-7.70 (m, 3H), 8.10 (dd, J = 1.5, 6.8 Hz, 2H), 8.88 (s, 1H) and 11.04 (s, 1H) ppm IA-33 340.15 2.63 H NMR (400.0 MHz, DMSO) d 2.92 (d, J = 4.7 Hz, 3H), 2.96 (s, 3H), 3.00 (s, 3H), 7.52 (d, J = 8.3 Hz, 2H), 7.55 (br s, 1H), 8.06 (d, J = 8.4 Hz, 3H) and 8.82 (s, 1H) ppm IA-34 500.1 3.23 1.61, 1.81 (2H, 2 × M), 3.17-3.73 (8H, m), 3.64 (3H, s), 7.48 (2H, m), 7.70-7.80 (5H, m), 8.15-8.24 (4H, m), 8.99 (1H, s) IA-35 342.03 3.2 7.64-7.72 (4H, m), 7.72 (1H, v br s), 8.21-8.24 (3H, m), 8.91 (1H, d), 9.09 (2H, d) IA-36 405.16 3.52 (DMSO) 2.98-3.02 (6H, m), 7.52-7.56 (4H, m), 7.80 (2H, br s), 8.17 (2H, m), 8.24 (2H, m), 9.00 (1H, s) IA-37 444 2.28 H NMR (400.0 MHz, DMSO) d 9.58 (d, J = 2.1 Hz, 2H), 9.14 (d, J = 3.4 Hz, 1H), 8.85 (BR S, 2H), 8.22-8.20 (m, 2H), 7.72-7.67 (m, 3H), 3.90 (t, J = 5.1 Hz, 1H), 3.76 (s, 1H), 3.58 (d, J = 5.1 Hz, 1H), 3.42 (t, J = 6.0 Hz, 2H), 3.28 (s, 1H), 3.24 (s, 1H), 3.17 (s, 1H) and 2.00 (d, J = 5.1 Hz, 2H) ppm IA-38 478 2.56 H NMR (400.0 MHz, DMSO) d 9.08 (d, J = 2.4 Hz, 1H), 8.77 (s, 2H), 8.21-8.17 (m, 2H), 8.00-7.98 (m, 2H), 7.74-7.67 (m, 3H), 3.91-3.88 (m, 1H), 3.79 (t, J = 5.9 Hz, 1H), 3.70-3.67 (m, 1H), 3.50 (t, J = 6.0 Hz, 2H), 3.44 (s, 1H), 3.32 (s, 1H), 3.17 (s, 1H), 2.10 (d, J = 5.3 Hz, 1H) and 2.00 (t, J = 4.9 Hz, 1H) ppm IA-39 510 2.6 H NMR (400.0 MHz, DMSO) d 8.69 (s, 2H), 8.45 (s, 1H), 8.01-7.99 (m, 2H), 7.95 (s, 1H), 7.79 (dd, J = 8.0, 18.7 Hz, 3H), 7.64-7.55 (m, 3H), 7.45-7.30 (m, 1H), 3.82-3.79 (m, 1H), 3.67 (d, J = 5.4 Hz, 1H), 3.41 (t, J = 5.8 Hz, 2H), 3.28 (s, 1H), 3.20 (s, 1H), 3.10 (s, 1H), 1.98 (s, 1H) and 1.89 (s, 1H) ppm IA-40 405.16 3.54 (DMSO) 2.98 (6H, m), 7.55-7.61 (3H, m), 7.73-7.85 (3H, m), 7.96 (1H, m), 8.02 (1H, m), 8.19 (2H, m), 9.01 (1H, s) IA-41 388.19 3.02 (DMSO) 2.98 (6H, m), 7.54 (2H, m), 7.71-7.75 (1H, m), 7.80 (2H, br s), 8.19 (2H, m), 8.55 (1H, m), 8.87 (1H, m), 9.02 (1H, s), 9.35 (1H, m) IA-42 436.1 3.6 H NMR (400.0 MHz, DMSO) d 2.97 (s, 3H), 3.01 (s, 3H), 7.46 (d, J = 8.9 Hz, 2H), 7.55 (d, J = 8.4 Hz, 2H), 7.69-7.71 (m, 3H), 8.09 (d, J = 8.3 Hz, 2H), 8.89 (s, 1H) and 11.22 (s, 1H) ppm IA-43 436.1 3.6 H NMR (400.0 MHz, DMSO) d 2.97 (s, 3H), 3.01 (s, 3H), 7.05 (d, 1H), 7.35 (d, J = 8.4 Hz, 1H), 7.50 (d, 3H), 7.65 (br s, 2H), 7.85 (s, 1H), 7.89 (s, 2H), 8.70 (s, 1H) and 11.30 (s, 1H) ppm IA-44 403.16 2.98 H NMR (400.0 MHz, DMSO) d 2.95 (s, 3H), 3.00 (s, 3H), 3.30 (s, 1H), 7.41 (s, 1H), 7.54 (d, J = 8.4 Hz, 2H), 7.68 (br s, 2H), 8.08 (d, J = 8.3 Hz, 1H), 8.11 (s, 0.5H), 8.13 (s, 0.5H), 8.25 (s, 1H), 8.81 (s, 1H), 8.88 (s, 1H) and 11.32 (s, 1H) ppm IA-45 396.16 2.87 H NMR (400.0 MHz, DMSO) d 2.96 (s, 3H), 3.00 (s, 3H), 3.55-3.57 (m, 4H), 3.76-3.78 (m, 4H), 7.51 (d, 2H), 7.63 (br s, 2H), 8.10 (d, 2H) and 8.86 (s, 1H) ppm IA-46 421.1 3.55 DMSO 3.03 (6H, d), 7.5 (1H, d), 7.6-7.7 (3H, m), 7.75 (1H, d), 7.85 (1H, brs), 8.1 (1H, d), 8.62 (1H, s) IA-47 443 2.87 H NMR (400.0 MHz, DMSO) d 9.32 (d, J = 1.9 Hz, 1H), 9.09 (d, J = 2.8 Hz, 1H), 8.87 (s, 2H), 8.65-8.61 (m, 1H), 8.19-8.17 (m, 2H), 7.82 (dd, J = 8.2, 14.6 Hz, 1H), 7.73-7.66 (m, 3H), 3.89-3.87 (m, 1H), 3.79-3.73 (m, 2H), 3.62 (t, J = 5.9 Hz, 1H), 3.35 (d, J = 3.0 Hz, 2H), 3.27 (s, 2H) and 2.09-2.03 (m, 2H) ppm IA-48 492 3.23 H NMR (400.0 MHz, DMSO) d 8.92 (s, 2H), 8.62 (d, J = 2.2 Hz, 1H), 8.32-8.29 (m, 1H), 8.07-8.04 (m, 2H), 7.91-7.84 (m, 2H), 7.79 (d, J = 7.2 Hz, 1H), 7.73-7.60 (m, 6H), 4.19-4.10 (m, 2H), 3.89-3.69 (m, 2H), 3.51-3.11 (m, 4H), 2.15 (t, J = 5.6 Hz, 1H) and 1.88 (s, 1H) ppm IA-49 316 3.9 H NMR (400.0 MHz, DMSO) d 9.00 (s, 1H), 8.24-8.17 (m, 4H), 7.78-7.71 (m, 5H), 7.61-7.57 (m, 2H) and 7.48 (t, J = 7.3 Hz, 1H) ppm IA-50 341 3.65 H NMR (400.0 MHz, DMSO) d 8.88 (s, 1H), 8.20-8.18 (m, 2H), 8.09 (d, J = 7.7 Hz, 1H), 8.01 (dd, J = 1.0, 7.9 Hz, 1H), 7.85 (td, J = 7.7, 3.0 Hz, 1H) and 7.70-7.62 (m, 4H) ppm IA-51 388.14 3.02 (DMSO) 2.95 (6H, m), 7.56 (2H, m), 7.69-7.73 (1H, m), 7.83 (2H, br s), 8.11-8.16 (3H, m), 8.32 (1H, m), 8.87 (1H, m), 9.01 (1H, s) IA-52 393.12 3.35 (DMSO) 3.02 (6H, m), 7.36-7.38 (1H, m), 7.54 (2H, m), 7.78 (2H, br s), 8.01-8.05 (2H, m), 8.17 (2H, m), 8.99 (1H, s) IA-53 404.16 2.62 (DMSO) 3.00 (6H, m), 6.47 (1H, t), 7.53-7.56 (2H, m), 7.65 (1H, m), 7.78 (2H, m), 8.13 (2H, m), 8.29-8.31 (1H, m), 8.98 (1H, s) IA-54 409.19 2.34 H NMR (400.0 MHz, DMSO) d 1.69-1.80 (m, 2H), 2.10-2.20 (m, 2H), 2.96 (s, 3H), 3.01 (s, 3H), 3.05-3.10 (m, 2H), 3.31-3.34 (m, 2H), 3.85 (br s, 1H), 7.53 (d, J = 8.3 Hz, 2H), 7.65 (br s, 2H), 8.06 (d, J = 8.3 Hz, 2H), 8.45 (d, J = 7.0 Hz, 1H) and 8.84 (s, 1H) ppm IA-55 416.2 3.27 H NMR (400.0 MHz, DMSO) d 2.96 (s, 3H), 3.00 (s, 3H), 4.50 (d, J = 6.1 Hz, 2H), 7.29 (d, J = 7.2 Hz, 1H), 7.35-7.42 (m, 4H), 7.51-7.53 (m, 2H), 7.65 (br s, 2H), 8.06 (dd, J = 1.5, 6.9 Hz, 2H) and 8.81 (d, J = 12.4 Hz, 2H) ppm IA-56 358 4.26 H NMR (400.0 MHz, DMSO) d 8.44 (s, 1H), 8.08-8.06 (m, 2H), 7.68-7.62 (m, 5H), 7.52 (dd, J = 0.8, 7.9 Hz, 1H), 7.47-7.40 (m, 2H), 7.32 (dd, J = 1.0, 7.4 Hz, 1H), 3.21 (qn, J = 6.8 Hz, 1H) and 1.27 (d, J = 6.8 Hz, 6H) ppm IA-57 344 4.14 — IA-58 331 2.98 — IA-59 355 3.56 — IA-60 317 2.37 — IA-61 332 3.85 — IA-62 346 3.41 — IA-63 367 2.63 — IA-64 317 2.39 — IA-65 346 3.87 — IA-66 373 3.22 H NMR (400.0 MHz, DMSO) d 10.13 (s, 1H), 8.83 (s, 1H), 8.24 (s, 1H), 8.19-8.17 (m, 2H), 7.76-7.69 (m, 7H), 7.44 (t, J = 7.9 Hz, 1H) and 2.10 (s, 3H) ppm IA-67 388.17 3.1 (DMSO) 3.02 (6H, m), 7.55 (2H, m), 7.83 (2H, br s), 8/10 (2H, m), 8.20 (2H, m), 8.92 (2H, m), 9.03 (1H, s) IA-68 458.07 2.62 dmso d6 1.60 (1H, m), 1.77 (1H, m), 2.72-2.39 (4H, m_, 3.40 (2H, m), 3.60-3.67 (2H, m), 7.52 (2H, d), 7.58-7.65 (3H, m), 7.99 (1H, m), 8.00 (2H, br hump), 8.10-8.14 (3h, m), 8.95 (1H, s) IIA-1 317 3.4 1H NMR (400.0 MHz, DMSO) d 7.32 (br s, 2H), 7.38 (dd, J = 4.3, 8.0 Hz, 1H), 7.52-7.56 (m, 2H), 7.59-7.64 (m, 1H), 8.12-8.14 (m, 2H), 8.24-8.27 (m, 1H), 8.44 (dd, J = 1.6, 4.8 Hz, 1H), 8.82 (s, 1H) and 9.11 (d, J = 1.8 Hz, 1H) ppm IIA-2 394 3.4 1H NMR (400.0 MHz, DMSO) d 3.27 (s, 3H), 7.58 (br s, 2H), 7.69-7.73 (m, 2H), 7.77-7.81 (m, 1H), 8.05 (d, J = 8.5 Hz, 2H), 8.32 (dd, J = 8.5, 18.0 Hz, 4H) and 9.04 (s, 1H) ppm IIA-3 441.21 3.13 (DMSO) 1.95 (2H, m), 3.25-3.96 (8H, m partially hidden by water peak), 7.08 (2H, br s), 7.54-7.61 (5H, m), 7.78 (1H, s), 8.03-8.05 (2H, m), 8.19 (2H, m), 8.72 (2H, br s), 8.89 (1H, s) IIIA-1 331.2 1.5 1H NMR (400.0 MHz, DMSO) d 15.03 (br s, 1H), 9.60 (s, 1H), 9.02 (s, 1H), 8.96 (d, J = 7.9 Hz, 1H), 8.74 (dd, J = 1.3, 5.2 Hz, 1H), 8.06 (s, 2H), 7.82 (dd, J = 5.2, 8.1 Hz, 1H), 7.74 (s, 2H), 7.39 (t, J = 7.8 Hz, 1H) and 7.03-6.98 (m, 1H) ppm IIIA-2 330 2.46 — IIIA-3 322 2.25 1H NMR (400.0 MHz, DMSO-d6) d 14.96 (s, 1H), 9.55 (s, 1H), 8.99 (s, 1H), 8.84 (d, J = 6.1 Hz, 1H), 8.69 (dd, J = 1.2, 4.9 Hz, 1H), 7.95 (s, 2H), 7.81 (d, J = 3.0 Hz, 1H), 7.73-7.68 (m, 2H) and 7.22 (dd, J = 3.8, 4.8 Hz, 1H) ppm IIIA-4 345 1.79 — IIIA-5 345 1.75 — IIIA-6 331.2 1.5 1H NMR (400.0 MHz, DMSO) d 15.03 (br s, 1H), 9.60 (s, 1H), 9.02 (s, 1H), 8.96 (d, J = 7.9 Hz, 1H), 8.74 (dd, J = 1.3, 5.2 Hz, 1H), 8.06 (s, 2H), 7.82 (dd, J = 5.2, 8.1 Hz, 1H), 7.74 (s, 2H), 7.39 (t, J = 7.8 Hz, 1H) and 7.03-6.98 (m, 1H) ppm

Example 73A: 3-amino-N-(1H-benzo[d]imidazol-2-yl)-6-(4-(dimethylcarbamoyl) phenyl)pyrazine-2-carboxamide (Compound V-1)

Compound V-1 was prepared using Method V-A, Steps 1-2

Method V-A Step 1: 3-Amino-6-(4-(dimethylcarbamoyl)phenyl)pyrazine-2-carboxylic acid

Methyl 3-amino-6-bromo-pyrazine-2-carboxylate (6.01 g, 25.9 mmol, 1.0 Eq.), 4-(dimethylcarbamoyl)phenylboronic acid (5.00 g, 25.9 mmol, 1.0 Eq.), Na₂CO₃ (5.49 g, 51.8 mmol, 2.0 Eq.) and Pd(PPh₃)₄(2.99 g, 2.59 mmol, 0.1 Eq.) in acetonitrile (30 mL) and water (30 mL) were heated at 90° C. for 16 hours. After cooling to ambient temperature the precipitate was removed by filtration. The aqueous filtrate was acidified to pH4 by addition of 1M HCl and then extracted with dichloromethane (3×20 mL), dried over MgSO₄ and concentrated in vacuo to give the sub-title product as a yellow solid (2.42 g, 65% Yield). 1H NMR (400.0 MHz, DMSO) δ 2.95 (3H, br s), 3.00 (3H, br s), 7.49-7.51 (2H, m), 7.58 (2H, br s), 8.15 92H, d), 8.95 (1H, s), 13.25 (1H, br s) ppm; MS (ES⁺) 287.13.

Step 2: 3-amino-N-(1H-benzo[d]imidazol-2-yl)-6-(4-(dimethylcarbamoyl) phenyl)pyrazine-2-carboxamide

Amino-6-(4-(dimethylcarbamoyl)phenyl)pyrazine-2-carboxylic acid (112.5 mg, 0.3930 mmol, 1.0 Eq.) in DMF (1.1 mL) was treated with 1H-benzimidazol-2-amine (62.8 mg, 0.4716 mmol, 1.2 Eq.) and triethylamine (39.8 mg, 54.8 μL, 0.3930 mmol, 1.0 Eq.) followed by the addition of TBTU (176.7 mg, 0.5502 mmol, 1.4 Eq.). The reaction mixture was allowed to stir at ambient temperature overnight then added dropwise to stirred water (15 ml). This was stirred at ambient temperature for 1 hour and the resultant precipitate isolated by filtration and washed with water. The residue was recrystallised from hot acetonitrile to give the title compound as a yellow solid (63.1 mg, 40% Yield). 1H NMR (400.0 MHz, DMSO) δ 2.97 (3H, br s), 3.02 (3H, br s), 7.15-7.18 (2H, m), 7.51-7.55 (4H, m), 7.83 (2H, br s), 8.34 (2H, d), 9.04 (1H, s), 11.50 (1H, br s), 12.35 (1H, br s) ppm; MS (ES⁺) 402.08.

Compounds V-1 to V-30 can also be prepared using a method similar to the one used to prepare compound V-1.

LCMS Cmpd LCMS R(t) No. ES+ min HNMR V-1 402.08 2.35 dmso d6 2.97, 3.02 (2 × 3H, 2 × s), 7.15-7.18 (2H, m), 7.51-7.55 (4H, m), 7.83 (2H, br s), 8.34 (2H, d), 9.04 (1H, s), 11.50 (1H, br hump), 12.35 (1H, br hump) V-2 482.2 2.72 1.61 + 1.76 (2H, 2 × m), 2.74-2.82 (3H, m), 2.90 (1H, m), 3.40 (2H, m), 3.53 (2H, m), 7.15 (2H, dt), 7.52 (2H, dt), 7.86 (1H, dq), 8.00-8.18 (2H, br hump), 8.06 (1H, m), 8.29 (1H, dd), 9.00 (1H, s) V-3 357.13 3 dmso d6 7.26 (2H, m), 7.60 (2H, m), 8.29 (1H, d), 8.0-8.5 (2H, br hump), 8.96 (1H, d), 9.15 (2H, d), V-4 457.3 2.42 MeOD 2.1-2.3 (2H, m), 3.3-3.4 (2H, m), 3.5-3.55 (1.5H, m), 3.6-3.65 (1.5H, m), 3.85-3.9 (1H, m), 4.1-4.15 (1.5H, m), 7.65 (2H, d), 7.6 (2H, d), 7.75-7.8 (2H, m), 8.25 (2H, d), 8.65 (1H, s), 8.8 (1H, s), 9.4 (1H, s), 10.7 (1H, s) V-5 458.2 2.77 DMSO1.8-2.0 (2H, m), 3.5-3.6 (2H, m), 3.7-3.8 (2H, m), 3.8-3.85 (2H, m), 7.35-7.4 (H, m), 7.6 (2H, d), 7.7 (2H, t), 7.8 (2H, s), 8.4 (2H, d), 8.7-8.8 (2H, m), 9.03 (1H, s), 11.8 (1H, s) V-6 456.2 2.45 DMSO1.8-2.0 (2H, m), 3.5-3.6 (2H, m), 3.7-3.8 (2H, m), 3.8-3.85 (2H, m), 6.6-6.7 (2H, m), 6.75 (1H, bs), 6.85 (1H, t), 7.2 (1H, d), 7.45 (2H, d), 7.9 (1.5H, s), 8.02 (2H, d), 8.7 (2H, brs), 8.7 (1H, s), 11.0 (1H, s) V-7 471.2 2.67 DMSO 1.8-2.0 (2H, m), 3.2-3.3 (3H, m), 3.3-3.4 (1H, m), 3.4-3.5 (1H, m), 3.6-3.75 (2H, m), 3.77 (3H, s), 3.8-3.9 (1H, m), 7.3-7.4 (2H, m), 7.55 (1H, d), 7.7 (1H, d), 7.9 (1H, vbrs), 8.33-8.4 (2H, m), 8.7-8.8 (2H, m), 9.05 (1H, s), V-8 457 2.77 DMSO 1.6-1.7 (1H, m), 1.8-1.85 (1H, m), 2.65-2.8 (3H, m), 2.85-2.9 (1H, m), 3.4-3.5 (2H, m), 3.55-3.6 (2H, m), 7.1-7.2 (1H, m), 7.3-7.5 (3H, m), 7.7-7.8 (2H, m), 8.3-8.4 (2H, m), 9.0 (1H, s), 10.9 (1H, s), 13.0 (1H, s), V-9 474.1 2.63 DMSO 2.8-2.9 (3H, m), 2.95-3.02 (1H.m), 3.35-3.45 (2H, m), 3.65-3.7 (2H, m), 7.35 (1H, t), 7.5-7.6 (4H, m), 7.7-7.8 (3H, m), 8.1 (1H, d), 8.35-8.4 (2H, m), 8.05 (1H, s) V-10 457.23 2.85 dmso d6 1.60 (1H, m), 1.76 (1H, m), 2.67-2.90 (4H, m), 3.35-3.44 (2H, m), 3.55-3.70 (2H, m), 7.14-7.16 (2H, m), 7.48-7.54 (4H, m), 7.82 (2H, br s), 8.30-8.37 (2H, m), 9.03 (1H, s) V-11 409 2.43 — V-12 409 3.11 — V-13 409 3.05 — V-14 333 2.06 — V-15 331 2.41 1H NMR (400.0 MHz, DMSO) d 11.00 (s, 1H), 10.67 (s, 1H), 9.65 (d, J = 1.9 Hz, 1H), 9.09 (s, 1H), 9.03 (d, J = 8.2 Hz, 1H), 8.73 (dd, J = 1.2, 5.2 Hz, 1H), 7.79 (dd, J = 5.2, 8.0 Hz, 3H), 7.50 (d, J = 7.8 Hz, 1H), 7.35 (t, J = 2.8 Hz, 1H), 7.21 (d, J = 7.4 Hz, 1H), 7.04 (t, J = 7.7 Hz, 1H) and 6.50 (dd, J = 2.0, 2.9 Hz, 1H) ppm V-16 331 8.42 — V-17 331 7.99 — V-18 409 3.05 — V-19 409 3.11 — V-20 409 2.43 — V-21 402.08 2.35 dmso d6 2.97, 3.02 (2 × 3H, 2 × s), 7.15-7.18 (2H, m), 7.51-7.55 (4H, m), 7.83 (2H, br s), 8.34 (2H, d), 9.04 (1H, s), 11.50 (1H, br hump), 12.35 (1H, br hump) V-22 474.1 2.63 DMSO 2.8-2.9 (3H, m), 2.95-3.02 (1H.m), 3.35-3.45 (2H, m), 3.65-3.7 (2H, m), 7.35 (1H, t), 7.5-7.6 (4H, m), 7.7-7.8 (3H, m), 8.1 (1H, d), 8.35-8.4 (2H, m), 8.05 (1H, s) V-23 457 2.77 DMSO 1.6-1.7 (1H, m), 1.8-1.85 (1H, m), 2.65-2.8 (3H, m), 2.85-2.9 (1H, m), 3.4-3.5 (2H, m), 3.55-3.6 (2H, m), 7.1-7.2 (1H, m), 7.3-7.5 (3H, m), 7.7-7.8 (2H, m), 8.3-8.4 (2H, m), 9.0 (1H, s), 10.9 (1H, s), 13.0 (1H, s), V-24 457.23 2.85 dmso d6 1.60 (1H, m), 1.76 (1H, m), 2.67-2.90 (4H, m), 3.35-3.44 (2H, m), 3.55-3.70 (2H, m), 7.14-7.16 (2H, m), 7.48-7.54 (4H, m), 7.82 (2H, br s), 8.30-8.37 (2H, m), 9.03 (1H, s) V-25 471.2 2.67 DMSO 1.8-2.0 (2H, m), 3.2-3.3 (3H, m), 3.3-3.4 (1H, m), 3.4-3.5 (1H, m), 3.6-3.75 (2H, m), 3.77 (3H, s), 3.8-3.9 (1H, m), 7.3-7.4 (2H, m), 7.55 (1H, d), 7.7 (1H, d), 7.9 (1H, vbrs), 8.33-8.4 (2H, m), 8.7-8.8 (2H, m), 9.05 (1H, s), V-26 456.2 2.45 DMSO1.8-2.0 (2H, m), 3.5-3.6 (2H, m), 3.7-3.8 (2H, m), 3.8-3.85 (2H, m), 6.6-6.7 (2H, m), 6.75 (1H, bs), 6.85 (1H, t), 7.2 (1H, d), 7.45 (2H, d), 7.9 (1.5H, s), 8.02 (2H, d), 8.7 (2H, brs), 8.7 (1H, s), 11.0 (1H, s) V-27 458.2 2.77 DMSO1.8-2.0 (2H, m), 3.5-3.6 (2H, m), 3.7-3.8 (2H, m), 3.8-3.85 (2H, m), 7.35-7.4 (H, m), 7.6 (2H, d), 7.7 (2H, t), 7.8 (2H, s), 8.4 (2H, d), 8.7-8.8 (2H, m), 9.03 (1H, s), 11.8 (1H, s) V-28 457.3 2.42 MeOD 2.1-2.3 (2H, m), 3.3-3.4 (2H, m), 3.5-3.55 (1.5H, m), 3.6-3.65 (1.5H, m), 3.85-3.9 (1H, m), 4.1-4.15 (1.5H, m), 7.65 (2H, d), 7.6 (2H, d), 7.75-7.8 (2H, m), 8.25 (2H, d), 8.65 (1H, s), 8.8 (1H, s), 9.4 (1H, s), 10.7 (1H, s) V-29 482.2 2.72 1.61 + 1.76 (2H, 2 × m), 2.74-2.82 (3H, m), 2.90 (1H, m), 3.40 (2H, m), 3.53 (2H, m), 7.15 (2H, dt), 7.52 (2H, dt), 7.86 (1H, dq), 8.00-8.18 (2H, br hump), 8.06 (1H, m), 8.29 (1H, dd), 9.00 (1H, s) V-30 357.13 3.00 dmso d6 7.26 (2H, m), 7.60 (2H, m), 8.29 (1H, d), 8.0-8.5 (2H, br hump), 8.96 (1H, d), 9.15 (2H, d),

The compounds of Table B were synthesized using the methods described herein as well as those known in the art. More specifically, the compounds were made using one or more of the following methods: benzothiazolyl compounds can be made according to methods described in Schemes I-H1 and I-H2; benzoxazolyl compounds can be made according to methods described in Schemes I-G1. Benzimidazolyl compounds can be made according to methods described in Schemes I-I1 and I-I2. Heteroaromatic amides can be made according to methods described in Schemes I-A1 and I-A2.

TABLE B LCMS Cmpd LCMS R(t) No. ES+ min HNMR III-7 532.34 3.71 Lot 1: dmso d6 1.28 + 1.44 (9H, 2 × s), 1.59 + 1.80 (2H, 2 × s), 3.35-3.73 (8H, m), 7.12 (1H, m), 7.32 (1H, m), 7.49 (3H, m), 8.36 (2H, m), 8.91 (1H, s), 13.36 (1H, s) III-8 432.22 2.53 Lot 1: dmso d6 1.60 + 1.76 (2H, 2 × s), 2.75-2.88 (4H, m), 3.38 (2H, d), 3.64 (2H, d), 7.11 (1H, m), 7.32 (1H, m), 7.52 (3H, m), 8.36 (2H, m), 8.89 (1H, s) III-9 460.28 2.55 — III-10 446.28 2.53 — III-11 418.19 2.51 — III-12 414.00 2.44 Lot 1: H NMR (400.0 MHz, DMSO) d 8.88 (s, 1H), 8.79 (s, 2H), 8.39 (d, J = 8.3 Hz, 2H), 7.72 (s, 2H), 7.58 (d, J = 8.3 Hz, 2H), 7.31 (q, J = 3.0 Hz, 2H), 3.86 (br s, 1H), 3.73 (br s, 1H), 3.65 (br s, 1H), 3.50 (br s, 1H), 3.34 (br s, 1H), 3.26 (br s, 3H), 2.06 (br s, 1H) and 1.96 (br s, 1H) ppm III-13 432.00 2.51 — III-14 428.00 2.56 — III-15 444.00 2.43 — III-16 442.00 2.45 Lot 1: H NMR (400.0 MHz, DMSO) d 9.65 (s, 1H), 8.88 (s, 1H), 8.39 (d, J = 8.3 Hz, 2H), 7.72 (s, 2H), 7.55 (d, J = 8.3 Hz, 2H), 7.31 (q, J = 2.9 Hz, 2H), 4.66 (br s, 1H), 3.80-2.97 (m, 2H), 2.79 (s, 3H), 2.78 (s, 3H), 2.00 (br s, 3H) and 1.64 (d, J = 9.7 Hz, 3H) ppm III-17 460.00 2.53 — III-18 456.00 2.58 — III-19 474.00 2.65 — III-20 472.00 2.45 Lot 1: H NMR (400.0 MHz, DMSO) d 9.63 (s, 1H), 8.85 (s, 1H), 8.37 (d, J = 8.4 Hz, 2H), 7.62 (d, J = 7.2 Hz, 1H), 7.55 (d, J = 8.3 Hz, 2H), 7.15 (s, 1H), 6.94 (dd, J = 2.1, 8.8 Hz, 1H), 4.65 (br s, 2H), 3.85 (s, 3H), 3.47 (br s, 3H), 2.78 (d, J = 4.9 Hz, 6H), 2.00 (br s, 2H) and 1.63 (d, J = 9.1 Hz, 2H) ppm III-21 510.00 2.79 — III-22 400.00 2.43 — III-23 418.00 2.50 — III-24 414.00 2.55 — III-25 432.00 2.64 — III-26 430.00 2.42 — III-27 468.00 2.76 — III-28 428.00 2.44 — III-29 446.00 2.51 — III-30 442.00 2.56 Lot 1: H NMR (400.0 MHz, DMSO) d 13.05 (s, 1H), 9.96 (s, 1H), 8.88 (s, 1H), 8.39 (d, J = 7.2 Hz, 2H), 7.67 (d, J = 8.4 Hz, 2H), 7.49 (s, 1H), 7.22 (t, J = 7.6 Hz, 1H), 7.09 (d, J = 7.2 Hz, 1H), 3.95-3.88 (m, 1H), 3.71-3.61 (m, 3H), 2.90-2.76 (m, 6H), 2.68-2.65 (m, 3H), 2.33 (s, 1H), 2.13 (d, J = 6.8 Hz, 1H) and 1.21 (t, J = 7.0 Hz, 1H) ppm III-31 460.00 2.63 — III-32 458.00 2.43 — III-33 433.00 3.26 Lot 1: H NMR (400.0 MHz, DMSO) d 13.35 (s, 1H), 8.90 (s, 1H), 8.36 (d, J = 7.3 Hz, 2H), 7.53-7.49 (m, 3H), 7.35-7.31 (m, 1H), 7.14-7.09 (m, 1H), 3.77-3.64 (m, 7H), 3.49 (d, J = 5.4 Hz, 1H), 1.91 (s, 1H) and 1.76 (s, 1H) ppm III-34 446.00 3.40 — III-35 482.00 2.79 — VI-1 431.12 3.47 (DMSO) 1.91-1.96 (2H, m), 3.25-3.49 (6H, m— partially hidden by water peak), 3.64-3.85 (3H, m), 7.51 (1H, m), 7.55 (3H, m), 8.16-8.19 (4H, m), 8.73 (1H, m), 8.97 (1H, s) VI-2 415.16 3.20 (DMSO) 2.00-2.12 (2H, m), 3.29-3.89 (8H, m) signal partially obscured by water peak, 7.51-7.59 (2H, m), 7.63-7.65 (2H, m), 7.96-7.99 (2H, m), 8.15 (2H, br s), 8.22-8.24 (2H, m), 8.77 (1H, s), 9.02 (1H, s) VI-3 531.19 4.09 (DMSO) 1.25-1.44 (12H, m), 1.62 (1H, m), 1.79 (1H, m), 3.41-3.63 (8H, m), 3.72 (1H, m)7.45-7.58 (3H, m), 7.61 (1H, m), 7.73 (1H, m), 8.16 (4H, m), 8.97 (1H, s) VII-1 400 3.55 — VII-2 384 3.23 — VII-3 387 2.98 H NMR (400.0 MHz, DMSO) d 10.56 (s, 1H), 9.08 (s, 1H), 8.55 (d, J = 8.7 Hz, 2H), 7.98 (d, J = 8.5 Hz, 2H), 7.86 (s, 2H), 6.08 (s, 1H), 3.64 (s, 3H), 3.27 (s, 3H) and 2.16 (s, 3H) ppm VII-4 398 2.88 VII-5 384 3.45 H NMR (400.0 MHz, DMSO) d 10.37 (s, 1H), 9.05 (s, 1H), 8.36 (dd, J = 1.8, 8.5 Hz, 2H), 8.08-8.02 (m, 3H), 7.93 (s, 2H), 7.80 (t, J = 7.8 Hz, 1H), 7.09 (d, J = 7.5 Hz, 1H), 3.28 (s, 3H) and 2.47 (s, 3H) ppm VII-6 370 2.63 — VII-7 377 2.90 — VII-8 390 3.13 — VII-9 400 2.22 — VII-10 412.2 2.33 H NMR (400.0 MHz, DMSO) d 2.27 (s, 3H), 2.98 (br s, 1H), 3.28 (s, 3H), 3.63 (s, 2H), 7.34 (d, J = 8.4 Hz, 2H), 7.75 (d, J = 8.5 Hz, 2H), 7.89 (Br s, 2H), 8.01 (d, J = 8.6 Hz, 2H), 8.51 (d, J = 8.5 Hz, 2H), 9.04 (s, 1H) and 10.43 (s, 1H) ppm VII-11 440.3 2.48 H NMR (400.0 MHz, DMSO) d 1.04 (d, J = 6.8 Hz, 6H), 2.11 (s, 3H), 2.89 (br s, 1H), 3.33 (sept, 1H), 3.48 (s, 2H), 7.18 (d, J = 8.4 Hz, 2H), 7.60 (d, J = 8.5 Hz, 2H), 7.73 (br s, 2H), 7.77 (d, J = 8.6 Hz, 2H), 8.37 (d, J = 8.5 Hz, 2H), 8.89 (s, 1H) and 10.28 (s, 1H) ppm VII-12 440.2 1.08 H NMR (400.0 MHz, DMSO) d 1.20 (d, J = 6.9 Hz, 6H), 2.30 (s, 3H), 3.46 (sept, 1H), 3.68 (s, 2H), 7.13 (d, 1H), 7.34 (t, 1H), 7.70 (d, 1H), 7.78 (br s, 1H), 7.93 (d, 2H), 7.94 (br s, 2H), 8.53 (d, 2H), 9.04 (s, 1H) and 10.43 (s, 1H) ppm VII-13 412.2 1.00 H NMR (400.0 MHz, DMSO) d 2.29 (s, 3H), 3.28 (s, 3H), 3.67 (s, 2H), 7.13 (d, 1H), 7.34 (t, 1H), 7.70 (d, 1H), 7.77 (s, 1H), 7.90 (br s, 2H), 8.01 (d, 2H), 8.51 (d, 2H), 9.04 (s, 1H) and 10.43 (s, 1H) ppm

Examples 75A: Cellular ATR Inhibition Assay

Compounds can be screened for their ability to inhibit intracellular ATR using an immunofluorescence microscopy assay to detect phosphorylation of the ATR substrate histone H2AX in hydroxyurea treated cells. HT29 cells are plated at 14,000 cells per well in 96-well black imaging plates (BD 353219) in McCoy's 5 A media (Sigma M8403) supplemented with 10% foetal bovine serum (JRH Biosciences 12003), Penicillin/Streptomycin solution diluted 1:100 (Sigma P7539), and 2 mM L-glutamine (Sigma G7513), and allowed to adhere overnight at 37° C. in 5% CO₂. Compounds are then added to the cell media from a final concentration of 25 μM in 3-fold serial dilutions and the cells are incubated at 37° C. in 5% CO₂. After 15 min, hydroxyurea (Sigma H8627) is added to a final concentration of 2 mM.

After 45 min of treatment with hydroxyurea, the cells are washed in PBS, fixed for 10 min in 4% formaldehyde diluted in PBS (Polysciences Inc 18814), washed in 0.2% Tween-20 in PBS (wash buffer), and permeabilised for 10 min in 0.5% Triton X-100 in PBS, all at room temperature. The cells are then washed once in wash buffer and blocked for 30 min at room temperature in 10% goat serum (Sigma G9023) diluted in wash buffer (block buffer). To detect H2AX phosphorylation levels, the cells are then incubated for 1 h at room temperature in primary antibody (mouse monoclonal anti-phosphorylated histone H2AX Ser139 antibody; Upstate 05-636) diluted 1:250 in block buffer. The cells are then washed five times in wash buffer before incubation for 1 h at room temperature in the dark in a mixture of secondary antibody (goat anti-mouse Alexa Fluor 488 conjugated antibody; Invitrogen A11029) and Hoechst stain (Invitrogen H3570); diluted 1:500 and 1:5000, respectively, in wash buffer. The cells are then washed five times in wash buffer and finally 100 ul PBS is added to each well before imaging.

Cells are imaged for Alexa Fluor 488 and Hoechst intensity using the BD Pathway 855 Bioimager and Attovision software (BD Biosciences, Version 1.6/855) to quantify phosphorylated H2AX Ser139 and DNA staining, respectively. The percentage of phosphorylated H2AX-positive nuclei in a montage of 9 images at 20× magnification is then calculated for each well using BD Image Data Explorer software (BD Biosciences Version 2.2.15). Phosphorylated H2AX-positive nuclei are defined as Hoechst-positive regions of interest containing Alexa Fluor 488 intensity at 1.75-fold the average Alexa Fluor 488 intensity in cells not treated with hydroxyurea. The percentage of H2AX positive nuclei is finally plotted against concentration for each compound and IC50s for intracellular ATR inhibition are determined using Prism software(GraphPad Prism version 3.0cx for Macintosh, GraphPad Software, San Diego Calif., USA).

The compounds described herein can also be tested according to other methods known in the art (see Sarkaria et al, “Inhibition of ATM and ATR Kinase Activities by the Radiosensitizing Agent, Caffeine: Cancer Research 59: 4375-5382 (1999); Hickson et al, “Identification and Characterization of a Novel and Specific Inhibitor of the Ataxia-Telangiectasia Mutated Kinase ATM” Cancer Research 64: 9152-9159 (2004); Kim et al, “Substrate Specificities and Identification of Putative Substrates of ATM Kinase Family Members” The Journal of Biological Chemistry, 274(53): 37538-37543 (1999); and Chiang et al, “Determination of the catalytic activities of mTOR and other members of the phosphoinositide-3-kinase-related kinase family” Methods Mol. Biol. 281:125-41 (2004)).

Example 76A: ATR Inhibition Assay

Compounds were screened for their ability to inhibit ATR kinase using a radioactive-phosphate incorporation assay. Assays were carried out in a mixture of 50 mM Tris/HCl (pH 7.5), 10 mM MgCl₂ and 1 mM DTT. Final substrate concentrations were 10 M [γ-33P]ATP (3mCi 33P ATP/mmol ATP, Perkin Elmer) and 800 μM target peptide (ASELPASQPQPFSAKKK).

Assays were carried out at 25° C. in the presence of 5 nM full-length ATR. An assay stock buffer solution was prepared containing all of the reagents listed above, with the exception of ATP and the test compound of interest. 13.5 μL of the stock solution was placed in a 96 well plate followed by addition of 2 μL of DMSO stock containing serial dilutions of the test compound (typically starting from a final concentration of 15 μM with 3-fold serial dilutions) in duplicate (final DMSO concentration 7%). The plate was pre-incubated for 10 minutes at 25° C. and the reaction initiated by addition of 15 μL [γ-33P]ATP (final concentration 10 μM).

The reaction was stopped after 24 hours by the addition of 30 μL 0.1M phosphoric acid containing 2 mM ATP. A multiscreen phosphocellulose filter 96-well plate (Millipore, Cat no. MAPHN0B50) was pretreated with 100 μL 0.2M phosphoric acid prior to the addition of 45 μL of the stopped assay mixture. The plate was washed with 5×200 μL 0.2M phosphoric acid. After drying, 100 μL Optiphase ‘SuperMix’ liquid scintillation cocktail (Perkin Elmer) was added to the well prior to scintillation counting (1450 Microbeta Liquid Scintillation Counter, Wallac).

After removing mean background values for all of the data points, Ki(app) data were calculated from non-linear regression analysis of the initial rate data using the Prism software package (GraphPad Prism version 3.0cx for Macintosh, GraphPad Software, San Diego Calif., USA).

Below is a chart showing the ATR Inhibition Ki values of compounds of the disclosure. Compounds with a Ki value of ≤10 nM are marked with “+++.” Compounds with a Ki value >10 nM but ≤100 nM are marked with “++.” Compounds with a Ki value >100 nM but ≤5 uM are marked with “+.”

Cmpd #: ATR Ki I-1 + I-2 +++ I-3 + I-4 + I-5 ++ I-6 + I-7 ++ I-8 + I-9 + I-10 + I-11 + I-12 + I-13 + I-14 + I-15 + I-16 + I-17 + I-18 + I-19 ++ I-20 ++ I-21 ++ I-22 ++ I-23 ++ I-24 ++ I-25 ++ I-26 + I-27 ++ I-28 +++ I-29 ++ I-30 ++ I-31 ++ I-32 ++ I-33 + I-34 ++ I-35 ++ I-36 ++ I-37 ++ I-38 ++ I-39 ++ I-40 + I-41 + I-42 + I-43 ++ I-44 ++ I-45 ++ I-46 + I-47 ++ I-48 + I-49 + I-50 + I-51 ++ I-52 + I-53 + I-54 + I-55 + I-56 + I-57 + I-58 + I-59 + I-60 + I-61 + I-62 + I-63 + I-64 + I-65 + I-66 ++ I-67 ++ I-68 ++ I-69 + I-70 ++ I-71 ++ I-72 ++ I-73 ++ I-74 ++ I-75 ++ I-76 ++ I-77 ++ I-78 ++ I-79 ++ I-80 ++ I-81 +++ I-82 ++ I-83 + I-84 + I-85 ++ I-86 ++ I-87 + I-88 + I-89 + I-90 + I-91 + I-92 + I-93 + I-94 + I-95 + I-96 + I-97 + I-98 + I-99 + I-100 + I-101 ++ I-102 ++ I-103 ++ I-104 ++ I-105 ++ I-106 ++ I-107 ++ I-108 +++ I-109 +++ I-110 + I-111 ++ I-112 +++ I-113 + I-114 +++ I-115 ++ I-116 + I-117 ++ I-118 +++ I-119 ++ I-120 ++ I-121 ++ I-122 ++ I-123 ++ I-124 ++ I-125 ++ I-126 + I-127 + I-128 ++ I-129 ++ I-130 + I-131 ++ I-132 ++ I-133 ++ I-134 +++ I-135 + I-136 + I-137 ++ I-138 ++ I-139 ++ I-140 ++ I-141 ++ I-142 ++ I-143 ++ I-144 +++ I-145 ++ I-146 ++ I-147 +++ I-148 ++ I-149 ++ I-150 ++ I-151 ++ I-152 ++ I-153 ++ IA-1 +++ IA-2 ++ IA-4 +++ IA-5 +++ IA-6 +++ IA-7 ++ IA-8 +++ IA-9 +++ IA-10 +++ IA-11 ++ IA-12 ++ IA-13 ++ IA-14 +++ IA-15 +++ IA-16 +++ IA-17 ++ IA-18 +++ IA-19 +++ IA-20 +++ IA-21 ++ IA-22 ++ IA-23 +++ IA-24 ++ IA-25 ++ IA-26 +++ IA-27 ++ IA-28 +++ IA-29 +++ IA-30 +++ IA-31 +++ IA-32 ++ IA-33 + IA-34 +++ IA-35 +++ IA-36 ++ IA-37 ++ IA-38 ++ IA-39 +++ IA-40 ++ IA-41 ++ IA-42 ++ IA-43 ++ IA-44 ++ IA-45 + IA-46 ++ IA-47 +++ IA-48 ++ IA-49 ++ IA-50 ++ IA-51 ++ IA-52 +++ IA-53 ++ IA-54 + IA-55 + IA-56 + IA-57 + IA-58 ++ IA-59 ++ IA-60 +++ IA-61 ++ IA-62 ++ IA-63 ++ IA-64 ++ IA-65 + IA-66 ++ IA-67 ++ IA-68 +++ IA-69 ++ IA-70 +++ IA-71 +++ IA-72 + IA-73 +++ IA-74 +++ IA-75 ++ IA-76 +++ IA-77 +++ IA-78 ++ IA-79 ++ IA-80 +++ IA-81 + IA-82 + IA-83 +++ IA-84 +++ IA-85 ++ IA-86 + IA-87 +++ IA-88 +++ IA-89 +++ IA-90 +++ IA-91 + IA-92 + IA-93 + IA-94 + IA-95 + IA-96 + IA-97 ++ IA-98 ++ IA-99 +++ IA-100 ++ IA-101 + IA-102 +++ IA-103 ++ IA-104 ++ IA-105 + IA-106 ++ IA-107 +++ IA-108 +++ IA-109 + IA-110 ++ IA-111 + IA-112 +++ IA-113 ++ IA-114 + IA-115 ++ IA-116 +++ IA-117 + IA-118 + IA-119 +++ IA-120 ++ IA-121 + IA-122 +++ IA-123 +++ IA-124 +++ IA-125 + IA-126 +++ IA-127 ++ IA-128 +++ IA-129 ++ IA-130 +++ IA-131 ++ IA-132 +++ IA-133 + IA-134 + IA-135 +++ IA-136 ++ IA-137 ++ IA-138 ++ IA-139 +++ IA-140 +++ IA-141 +++ IA-142 +++ IA-143 ++ IA-144 ++ IA-145 +++ IA-146 +++ IA-147 +++ IA-148 + IA-149 +++ IA-150 + IA-151 ++ IA-152 +++ IA-153 ++ IA-154 +++ IA-155 ++ IA-156 + IA-157 ++ IA-158 +++ IA-159 +++ IA-160 + IA-161 ++ IA-162 ++ IA-163 + IA-164 + IA-165 ++ IA-166 +++ IA-167 +++ IA-168 + IA-169 +++ IA-170 ++ IA-171 +++ IA-172 +++ IA-173 +++ IA-174 + IA-175 +++ IA-176 + IA-177 ++ IA-178 +++ IA-179 +++ IA-180 ++ IA-181 +++ IA-182 + IA-183 +++ IA-184 ++ IA-185 ++ IA-186 + IA-187 ++ IA-188 + IA-189 ++ IA-190 + IA-191 +++ IA-192 + IA-193 +++ IA-194 + IA-195 ++ IA-196 +++ IA-197 +++ IA-198 ++ IA-199 + IA-200 + IA-201 +++ IA-202 + IA-203 + IA-204 ++ IA-205 +++ IA-206 + IA-207 + IA-208 +++ IA-209 ++ IA-210 ++ IA-211 + IA-212 +++ IA-213 ++ IA-214 ++ IA-215 +++ IA-216 + IA-217 + IA-218 ++ IA-219 + IA-220 +++ IA-221 + IA-222 +++ IA-223 ++ IA-224 + IA-225 ++ IA-226 +++ IA-227 + IA-228 +++ IA-229 + IA-230 ++ IA-231 ++ IA-232 ++ IA-233 ++ IA-234 +++ IA-235 +++ IA-236 ++ IA-237 ++ IA-238 +++ IA-239 + IA-240 + IA-241 +++ IA-242 +++ IA-243 +++ IA-244 + IA-245 ++ IA-246 +++ IA-247 ++ IA-248 +++ IA-249 ++ IA-250 + IA-251 + IA-252 ++ IA-253 + IA-254 + IA-255 + IA-256 +++ IA-257 +++ IA-258 +++ IA-259 ++ IA-260 ++ IA-261 ++ IA-262 +++ IA-263 ++ IA-264 +++ IA-265 + IA-266 ++ IA-267 ++ IA-268 ++ IA-269 +++ IA-270 +++ IA-271 + IA-272 + IA-273 ++ IA-274 +++ IA-275 ++ IA-276 +++ IA-277 +++ IA-278 + IA-279 + IA-280 +++ IA-281 +++ IA-282 +++ IA-283 ++ IA-284 +++ IA-285 +++ IA-286 + IA-287 + IA-288 +++ IA-289 +++ IA-290 +++ IA-291 +++ IA-292 +++ IA-293 +++ IA-295 +++ IA-296 +++ IA-297 +++ IA-299 +++ IA-300 +++ IA-301 +++ IA-302 +++ IA-303 +++ IA-304 +++ IA-305 +++ IA-306 +++ IA-307 +++ IA-308 +++ IA-309 +++ IA-310 +++ IA-311 +++ IA-312 +++ IA-313 +++ IA-314 +++ IA-315 +++ IA-316 +++ IA-318 + IA-319 +++ IA-320 +++ IA-321 +++ IA-322 +++ IA-323 +++ IA-324 +++ IA-325 ++ IA-326 +++ IA-327 +++ IA-328 +++ IA-329 +++ IA-330 +++ IA-331 +++ IA-332 +++ IA-333 +++ IA-334 +++ IA-335 +++ IA-336 +++ IA-337 +++ IA-338 +++ IA-339 +++ IA-340 +++ IA-341 +++ IA-342 +++ IA-343 +++ IA-344 +++ IA-345 +++ IA-346 +++ IA-347 +++ IA-348 +++ IA-349 +++ IIA-1 ++ IIA-2 +++ IIA-3 +++ IIA-4 +++ IIA-5 +++ IIA-6 +++ IIA-7 +++ IIA-8 +++ IIA-9 +++ IIA-10 +++ IIA-11 +++ IIA-12 +++ IIA-13 +++ IIA-14 +++ IIA-15 IIA-16 +++ IIIA-1 ++ IIIA-2 ++ IIIA-3 ++ IIIA-4 ++ IIIA-5 ++ IIIA-6 ++ IVA-1 +++ IVA-2 +++ IVA-3 + III-1 ++ III-2 ++ III-3 ++ III-4 ++ III-5 ++ III-6 ++ III-7 +++ III-8 +++ III-9 ++ III-10 ++ III-11 +++ III-12 ++ III-13 ++ III-14 ++ III-15 ++ III-16 ++ III-17 ++ III-18 ++ III-19 ++ III-20 ++ III-21 ++ III-22 ++ III-23 ++ III-24 ++ III-25 ++ III-26 ++ III-27 + III-28 ++ III-29 ++ III-30 ++ III-31 ++ III-32 ++ III-33 +++ III-34 ++ III-35 ++ V-1 +++ V-2 +++ V-3 +++ V-4 ++ V-5 ++ V-6 + V-7 + V-8 +++ V-9 ++ V-10 +++ V-11 +++ V-12 +++ V-13 + V-14 + V-15 + V-16 ++ V-17 ++ V-18 + V-19 +++ V-20 +++ V-21 +++ V-22 ++ V-23 +++ V-24 +++ V-25 + V-26 + V-27 ++ V-28 ++ V-29 +++ V-30 +++ VI-1 ++ VI-2 ++ VI-3 ++ VII-1 ++ VII-2 ++ VII-3 + VII-4 ++ VII-5 ++ VII-6 ++ VII-7 ++ VII-8 ++ VII-9 +++ VII-10 + VII-11 ++ VII-12 +++ VII-13 ++

Example 77A: Cisplatin Sensitization Assay

Compounds were screened for their ability to sensitize HCT116 colorectal cancer cells to Cisplatin using a 96 h cell viability (MTS) assay. HCT116 cells, which possess a defect in ATM signaling to Cisplatin (see, Kim et al.; Oncogene 21:3864 (2002); see also, Takemura et al.; JBC 281:30814 (2006)) were plated at 470 cells per well in 96-well polystyrene plates (Costar 3596) in 150 μl of McCoy's 5 A media (Sigma M8403) supplemented with 10% foetal bovine serum (JRH Biosciences 12003), Penicillin/Streptomycin solution diluted 1:100 (Sigma P7539), and 2 mM L-glutamine (Sigma G7513), and allowed to adhere overnight at 37° C. in 5% CO₂. Compounds and Cisplatin were then both added simultaneously to the cell media in 2-fold serial dilutions from a top final concentration of 10 μM as a full matrix of concentrations in a final cell volume of 200 μl, and the cells were then incubated at 37° C. in 5% CO₂. After 96 h, 40 μl of MTS reagent (Promega G358a) was added to each well and the cells were incubated for 1 h at 37° C. in 5% CO₂. Finally, absorbance was measured at 490 nm using a SpectraMax Plus 384 reader (Molecular Devices) and the concentration of compound required to reduce the IC50 of Cisplatin alone by at least 3-fold (to 1 decimal place) was reported.

Compounds with an IC50 or Ki value of ≤100 nM are marked with “+++.” Compounds with an IC50 or Ki value >100 nM but ≤1 uM are marked with “++.” Compounds with an IC50 or Ki value >1 uM but ≤20 uM are marked with “+.”

TABLE C ATR Cellular Inhibition ATR HTC116 Synergy with Compound Assay Ki Inhibition (MTS) Cisplatin No. (uM) IC50 (uM) IC50 (uM) (uM) I-82 +++ + + ++ IA-159 +++ +++ ++ +++ IIA-11 +++ +++ ++ +++ III-8 +++ ++

While we have described a number of embodiments of this invention, it is apparent that our basic examples may be altered to provide other embodiments that utilize the compounds, methods, and processes of this invention. Therefore, it will be appreciated that the scope of this invention is to be defined by the appended claims rather than by the specific embodiments that have been represented by way of example herein. 

We claim:
 1. A compound selected from the group consisting of:

or a pharmaceutically acceptable salt thereof.
 2. The compound of claim 1, wherein the compound is:

or a pharmaceutically acceptable salt thereof.
 3. The compound of claim 1, wherein the compound is:

or a pharmaceutically acceptable salt thereof.
 4. The compound of claim 1, wherein the compound is:

or a pharmaceutically acceptable salt thereof.
 5. A pharmaceutical composition comprising a pharmaceutically acceptable carrier and a compound of claim 1, or a pharmaceutically acceptable salt thereof.
 6. A method of sensitizing a cancer cell in a patient to a DNA damaging agent, comprising administering to a patient in need thereof an effective amount of the compound of claim
 1. 7. The method of claim 6, wherein the cancer cell expresses a DNA damaging oncogene.
 8. The method of claim 7, wherein the cancer cell has altered expression or activity of one or more proteins selected from the group consisting of K-Ras, N-Ras, H-Ras, Raf, Myc, Mos, E2F, Cdc25A, CDC4, CDK2, Cyclin E, Cyclin A and Rb.
 9. The method of claim 6, wherein the cancer cell has a defect in ataxia telangiectasia mutated signaling cascade.
 10. The method of claim 9, wherein the defect is altered expression or activity of one or more proteins selected from the group consisting of ataxia telangiectasia mutated, p53, checkpoint kinase 2, MRE11, RAD50, NBS1, 53BP1, MDC1 and H2AX. 